For your consideration, here is are two K-9 Corps series cop science fiction paperback books, numbers 3 and 4 in the series, by Kenneth Von Gunden, from Ace Science Fiction. Both are Ace editions. Both have wear on the edges of the covers and tanning inside of the covers and on the edges of the pages a little bit. Items pictured are the actual items up for sale and come from a non-smoking household. (20.210i-1.0bb)

Here are the books with the number in the series, title, publication date and number of pages:

3. Cry Wolf, February, 1992, 250

4. The Last Resort, January, 1993, 252