Quote:
Originally Posted by eschwartz
If a book was bought from Amazon, it will have an exth 113 field, which contains the ASIN (product identifier). When calibre imports the AZW* file, it will add this ASIN as the identifier "mobi-asin".
If a book has the mobi-asin identifier, it is a pretty good bet that the book was originally from Amazon.
Of course, I also add a tag for any book that isn't from Amazon, to indicate where it came from. (Tags are useless, so I use them to keep track of other information, like original source, if the book is an omnibus/anthology, and whether or not any metadata or editing work needs to be done.)
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Out of curiosity, why do you say tags are useless? On those files that I have modified the tags to my own specifications I find tags are very useful for finding a book in the genre I want to read next.