Happy to help....the 1975 Nolan Ryan card (#10) was part of a 42 card set otherwise known as the 'Superstar' set. The cards have a glossy-type finish and were sold in complete sets by TCMA/SSPC. Ryan can be seen in the background of #9 Vada Pinson in this set as well.
The 1976 Ryan card (#187, linked) was part of the large 630 card set, also known as the 'pure' card set. On the backs of these cards it lists a 1975 copyright date, but the set did come out in 1976.
I loved all of the SSPC sets as a kid, it was a fine alternative to Topps, Kelloggs, and Hostess. But it seems like 95% of the photos in the 'pure' card set were taken at Shea Stadium......all teams came through there because Yankee stadium was being renovated at the time, so it saved the photographers some travel money, for sure.