Books not in a series

Detective Fiction Weekly. Vol. 44, No. 5, September 28, 1929

Flynn’s Weekly Detective Fiction. Vol. 27, No. 1, September 17, 1927

Flynn’s Weekly Detective Fiction. Vol. 27, No. 2, September 24, 1927

Flynn’s Weekly Detective Fiction. Vol. 28, No. 3, November 12, 1927