well, maybe too easy, but the answer is not fully correct...
it was the list of all the unasissted triple plays in American League.
There were some in the National League, too, of coz:
Ernie Padgett 1923
Glenn Wright 1925
Jimmy Cooney 1927
Mickey Morandini 1992
not much, but I knew that exactly, because Morandinis Play was the first I can remember and it was the first in a couple of years...