There are some items where the ISBN is in unusual places or pages without a copyright indicator like the front page. Example: https://archive.org/details/naturalizationpr00unit It may be useful to search every page for ISBN's.
There are some items where the ISBN is in unusual places or pages without a copyright indicator like the front page. Example: https://archive.org/details/naturalizationpr00unit
It may be useful to search every page for ISBN's.