Doug Selby is a 6-book series with 6 primary works first released in 1937 with contributions by Erle Stanley Gardner.
1937 • 2 Readers • 192 pages • 4
1938 • 1 Reader • 171 pages
1939 • 1 Reader • 216 pages
1939 • 1 Reader • 112 pages • 3
1946 • 1 Reader
1948 • 1 Reader • 201 pages
1949 • 1 Reader • 245 pages