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eschwartz · 01-23-2015, 01:21 AM

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.)

01-23-2015, 01:21 AM	#4
eschwartz Ex-Helpdesk Junkie Posts: 19,421 Karma: 85400180 Join Date: Nov 2012 Location: The Beaten Path, USA, Roundworld, This Side of Infinity Device: Kindle Touch fw5.3.7 (Wifi only)	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.) Last edited by eschwartz; 01-23-2015 at 01:23 AM.