Item not on GR, though error message says it is

[Stelleri]

I tried to add this book and received this error message:

Isbn is taken by an existing book with the title "Charley Harper: Birds: A Book of Postcards". Search for 0764953729 in the header to view it. If you believe this is an error please double-check your data, then check the Goodreads Librarians group. ISBNs are optional so you can also add this book without an ISBN.
Isbn13 is taken by an existing book with the title "Charley Harper: Birds: A Book of Postcards". Search for 9780764953729 in the header to view it. If you believe this is an error please double-check your data, then check the Goodreads Librarians group. ISBNs are optional so you can also add this book without an ISBN.

I cannot find it here by searching author, title, either ISBN, or 0764953729.

[Renske]

It could be that this book was marked as Not A Book. The word Postcards in the title could have made someone think it is not a book but postcards. But it is an actual book?

[rivka, Former Moderator]

According to the description on Amazon, it is 30 postcards bound together temporarily. So it is correctly marked as NOT A BOOK on Goodreads.

[Stelleri]

Okay, good to know. GR lists many of his non-book items.

[rivka, Former Moderator]

I think I got them all now. Thanks for letting us know!