You do understand that 35th wasn't the cutoff?
The rules were top 25, plus any Americans up to 25 total. So the cut off could be 35th or 40th or 45th.
The first year of the backdoor All Americas was 1974. I happen to be the last AA of that year -- 39th place. (14 foreign athletes in the top 25.)
I did not know that. I thought the "backdoor" route was introduced much later. Thanks for correcting.
Full list of competitors is here: