The Baffling River Boat Mystery

Master Detective - 1941-12

This transportation-themed issue also features Murder Rides The Wind and Death Takes A Taxicab


The Riddle Of Old Man Ridley

Real Detective September 1933

Also, Starving Slaves of the Sweat Shops


Michigan: The Plundered State

Real Detective June 1933

I’m not sure about this artist tag. It is listed as “Alex Redmond,” but the signature on the cover itself says “Arnold Redmond.”