Ok I think I have one of them. Somehow I missed "Marvin Duke" in my dad's notes. Duke doesn't appear on
http://pittsburgh.pirates.mlb.com/pi...ry/players.jsp or on
http://www.baseball-reference.com/teams/PIT/1938.shtml. But there is a mention of him pitching against Chicago in the Pittsburgh Post-Gazette from 4/15/38.
https://www.newspapers.com/newspage/88658734/
And there is a passage about him being sent down to Montreal in May of '38 in Ronald T. Waldo's book,
Pennant Hopes Dashed... on page 99.
https://books.google.com/books?id=Ck...irates&f=false
So, one down, two to go!