Trading Card Set #1, Topps, 1971.
55 yellow cards in set. Puzzle and song backs. Trading Card Set #2, Topps, 1971. 55 blue
cards in set. Puzzle and song backs. Trading Cars Set #3, Topps, 1971. 88 green
cards in set. Puzzle and song backs.
Above linked photos from "Collector's Guide to TV Memorabilia, 1960s & 1970s" by Greg Davis and Bill Morgan (first edition). Used without permission.
Also:
Partridge Family Posters
(see right and artwork above)