Green Light for Death x 4

1949 Ivy Washburn hardcover

1950 Readers Choice Library #8,

cover art by Wayne Blickenstaff

cover art by Victor Kalin

1956 Dell reissue

1964 edition from Spain

1973 Mayflower edition from Britain

The Case of the Smoking Chimney x 5

1943  Morrow hardcover

1950 Pocket reissue

2nd book with Gramps Wiggins

cover art by Wayne Blickenstaff

1961 Pocket reissue – cover art by Charles Binger

better image than previously posted

1963 Horwitz edition from Australia

1963 British edition from Penguin

cover art by Sheila Perry