I have 3 metadata plugins enabled: B&N (by kiwidude), Google and Amazon.com.
When I search the ISBN of 9780471741725, I get only one search result listed, but the log shows that each of the these sources returned results.
Screenshot of the results:

Log:
Code:
Starting download
Query: title:Cuisine and Culture: A History of Food and People; authors:Linda Civitello; isbn:9780471741725
Running identify query with parameters:
{u'authors': [u'Linda Civitello'], u'identifiers': {u'isbn': u'9780471741725'}, u'timeout': 30, u'title': u'Cuisine and Culture: A History of Food and People'}
Using plugins: Barnes & Noble, Google, Amazon.com
The log from individual plugins is below
****************************** Amazon.com ******************************
Request extra headers: [('User-agent', 'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.0.249.78 Safari/532.5')]
Found 1 results
Downloading from Amazon.com took 4.4849998951
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Title : Cuisine and Culture: A History of Food and People
Author(s) : Linda Civitello
Publisher : Wiley
Language : en
Rating : 3.5
Published : 2007-03-09T00:00:00+00:00
Identifiers : amazon:0471741728, isbn:9780471741725
Comments : <h3>Review</h3><p>"...Tracing the connection between major historical events and their affect on different culinary traditions, this hearty meal of 12 "courses" explains everything from how the Franch gained their gastronomic stature to the roots of American cuisine..." (_Sante_) </p><p>"...Based on the sweep self-assurance and verve exhibited in this book, subtitled "A History of Food and People,: we will be reading more of and from her. "Ah," you say "a game of trivia." Not really, it's too satisfying." (_Chicago Tribune_) </p><h3>Product Description</h3><p>An illuminating account of how history shapes our diets-now revised and updated</p><p>Why did the ancient Romans believe cinnamon grew in swamps guarded by giant killer bats? How did the African cultures imported by slavery influence cooking in the American South? What does the 700-seat McDonald's in Beijing serve in the age of globalization? With the answers to these and many more such questions, <em>Cuisine and Culture, Second Edition</em> presents an engaging, informative, and witty narrative of the interactions among history, culture, and food.</p><p>From prehistory and the earliest societies around the Tigris and Euphrates Rivers to today's celebrity chefs, <em>Cuisine and Culture, Second Edition</em> presents a multicultural and multiethnic approach that draws connections between major historical events and how and why these events affected and defined the culinary traditions of different societies. Fully revised and updated, this Second Edition offers new and expanded features and coverage, including:</p><ul> <li> New Crossing Cultures sections providing brief sketches of foods and food customs moving between cultures </li> <li> More holiday histories, food fables, and food chronologies </li> <li> Discussions of food in the Byzantine, Portuguese, Turkish/Ottoman, and Austro-Hungarian empires </li> <li> Greater coverage of the scientific genetic modification of food, from Mendel in the 19th century to the contemporary GM vs. organic food debate </li> <li> Speculation on the future of food </li> <li> And much more! </li></ul><p>Complete with sample recipes and menus, as well as revealing photographs and illustrations, <em>Cuisine and Culture, Second Edition</em> is the essential survey history for students of food history. </p>
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****************************** Google ******************************
Request extra headers: [('User-agent', 'Mozilla/5.0 (Windows NT 5.2; rv:2.0.1) Gecko/20100101 Firefox/4.0.1')]
Found 1 results
Downloading from Google took 1.00600004196
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Title : Cuisine and Culture: A History of Food and People
Author(s) : Linda Civitello
Publisher : John Wiley and Sons
Tags : Food - History, Food - Social Aspects, Food, History, Social Aspects, Cooking, Essays, General
Rating : 1.0
Published : 2007-02-21T10:51:09.812000+00:00
Identifiers : google:JCmLY7aAqWgC, isbn:9780471741725
Comments : An illuminating account of how history shapes our diets-now revised and updated Why did the ancient Romans believe cinnamon grew in swamps guarded by giant killer bats? How did the African cultures imported by slavery influence cooking in the American South? What does the 700-seat McDonald's in Beijing serve in the age of globalization? With the answers to these and many more such questions, Cuisine and Culture, Second Edition presents an engaging, informative, and witty narrative of the interactions among history, culture, and food. From prehistory and the earliest societies around the Tigris and Euphrates Rivers to today's celebrity chefs, Cuisine and Culture, Second Edition presents a multicultural and multiethnic approach that draws connections between major historical events and how and why these events affected and defined the culinary traditions of different societies. Fully revised and updated, this Second Edition offers new and expanded features and coverage, including: New Crossing Cultures sections providing brief sketches of foods and food customs moving between cultures More holiday histories, food fables, and food chronologies Discussions of food in the Byzantine, Portuguese, Turkish/Ottoman, and Austro-Hungarian empires Greater coverage of the scientific genetic modification of food, from Mendel in the 19th century to the contemporary GM vs. organic food debate Speculation on the future of food And much more! Complete with sample recipes and menus, as well as revealing photographs and illustrations, Cuisine and Culture, Second Edition is the essential survey history for students of food history.
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****************************** Barnes & Noble ******************************
Request extra headers: [('User-agent', 'Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.11) Gecko/20101012 Firefox/3.6.11')]
Found 1 results
Downloading from Barnes & Noble took 7.9430000782
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Title : Edition 2
Author(s) : Linda Civitello
Publisher : Wiley, John & Sons, Incorporated
Rating : 4.0
Published : 2007-03-01T00:00:00+00:00
Identifiers : barnesnoble:Cuisine-and-Culture/Linda-Civitello/e/9780471741725, isbn:9780471741725
Comments : <p><strong>Synopsis:</strong></p><p>An illuminating account of how history shapes our diets-now revised and updated</p><p>Why did the ancient Romans believe cinnamon grew in swamps guarded by giant killer bats? How did the African cultures imported by slavery influence cooking in the American South? What does the 700-seat McDonald's in Beijing serve in the age of globalization? With the answers to these and many more such questions, <em>Cuisine and Culture, Second Edition</em> presents an engaging, informative, and witty narrative of the interactions among history, culture, and food.</p><p>From prehistory and the earliest societies around the Tigris and Euphrates Rivers to today's celebrity chefs, <em>Cuisine and Culture, Second Edition</em> presents a multicultural and multiethnic approach that draws connections between major historical events and how and why these events affected and defined the culinary traditions of different societies. Fully revised and updated, this Second Edition offers new and expanded features and coverage, including:</p><ul> <li> New Crossing Cultures sections providing brief sketches of foods and food customs moving between cultures </li> <li> More holiday histories, food fables, and food chronologies </li> <li> Discussions of food in the Byzantine, Portuguese, Turkish/Ottoman, and Austro-Hungarian empires </li> <li> Greater coverage of the scientific genetic modification of food, from Mendel in the 19th century to the contemporary GM vs. organic food debate </li> <li> Speculation on the future of food </li> <li> And much more! </li></ul><p>Complete with sample recipes and menus, as well as revealing photographs and illustrations, <em>Cuisine and Culture, Second Edition</em> is the essential survey history for students of food history. <strong>Biography:</strong></p><p><strong>LINDA CIVITELLO</strong> has a B.A. from Vassar College and an M.A. in history from UCLA. She has taught food history in California and written extensively for television. The previous edition of <em>Cuisine and Culture</em> won the 2003 Gourmand World Cookbook Award for Best Culinary History Book.</p>
Querying: http://search.barnesandnoble.com/books/product.aspx?EAN=9780471741725
ISBN match location: u'http://search.barnesandnoble.com/Cuisine-and-Culture/Linda-Civitello/e/9780471741725'
B&N url: u'http://search.barnesandnoble.com/Cuisine-and-Culture/Linda-Civitello/e/9780471741725'
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The identify phase took 8.02 seconds
The longest time (7.943000) was taken by: Barnes & Noble
Merging results from different sources and finding earliest publication dates
We have 1 merged results, merging took: 0.00 seconds
Why did it take the Publisher information, and Review from Amazon.com but the title of the book from B&N?
How does it calculate the 2 star rating? Does it calculate the average of the ratings and floors the result?
Note that the fact that the title is "Edition 2" is probably a bug in kiwidude's B&N plugin (here's the actual title:
http://search.barnesandnoble.com/Cui.../9780471741725)