Science books / text books

[Annika]

What is the policy when combining non-fiction books, eg text books that are updated every few years.
Updated as in sections added or removed and parts re-written?
Bottom line is that it is the same book, but the content, pc etc can vary significantly.

One such case is:

https://www.goodreads.com/book/show/3...

https://www.goodreads.com/book/show/2...

Same title, heavily reduced pc: https://www.goodreads.com/book/show/2...

[rivka, Former Moderator]

We generally do combine new editions of textbooks and similar books with old ones. There are rarely major changes from one edition to the next.

[Annika]

Thanks Rivka.