[SunkenCiv]

Looks like it is out of print. But Amazon has it listed, and there are used copies available. Also, in the Google search I found the title in a curriculum, and various other used copies and bibliographies.

[668 - Neighbor of the Beast]

I found a copy some years back at a library reject sale. (Amazing what they consider unworthy!)

I don’t recommend many, and it’s definitely worth hunting down. Ask your local librarian to do an inter-library loan search. Whatever it takes! :)