For your consideration, here is a Lot of 3 White Indian Series Paperbacks Books, no. 20, 22 and 24, by Donald Clayton Porter. All have some wear on the covers and some tanning on the end pages. Items pictured are the actual items up for sale and come from a non-smoking household. (191.265k-1.12sc)
Here are the books, with the number in the series, title, printing history and additional condition notes:
20. Sachem's Son, Bantam edition, December, 1990, has some wear on the edges of the covers
22. Seneca Patriots, Bantam edition, January, 1992, has some wear on the edges of the covers, creases in the spine, some tanning inside of the covers
24. Father and Son, Bantam edition, June, 1993, has some wear on the edges of the covers, creases and a twist to the spine, heavy tanning inside of the covers and pages are wavy on the edge, last 70 pages
[Thanks for looking!]