I have seen the 979 only from amazon-books, this is why i want them separated from the "typical suspects". And i have a lot of old books which dont have ISBN: Books from GDR, all books older than somewhen in the 50s. And sometimes a new book comes out as kindle-only and later the autor sells these books as printed book. And we know amazon never "buys" isbns for their electronic books, only for printed ones. So i have to wait to get an isbn for these books. Coloring helps much to get directly the state of that books.
Other thing with isbn: When you dont have an isbn for a (new) printed book, you cannot sell these in shops, i _only_ can buy when i show that i am over eighteen in age. Look at festa (german publisher), they have a section called "festa-extrem" most books dont have any isbn: no open selling! You even cannot buy these books used in the wild from shops or online-shops. You only get them via the bay or other private selling sites.
(I have been working some time in a book-shop, so isbn is the most important thing for me to distinguish books! On the other hand i find it interesting that long time ago (isbn-10 times) some isbns were given to different books, say you can find 2 books with different titles and autors but the same isbn)
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