Another anecdote - I sold a technical book through one of the big publishers, never heard back post advances, and found out that the international edition wasn'

Another anecdote - I sold a technical book through one of the big publishers, never heard back post advances, and found out that the international edition wasn't considered to be part of my royalty agreement. This was bad for my coauthors and I as the international edition became part of the curriculum for several universities for several years. Live and learn.