Professor Challenger is a 5-book series with 5 primary works first released in 1900 with contributions by Arthur Conan Doyle.
#1 of 5 in Professor Challenger
1900 • 137 Readers • 416 pages • 3.7
#2 of 5 in Professor Challenger
1913 • 14 Readers • 120 pages • 3.3
#4 of 5 in Professor Challenger
1928 • 5 Readers • 64 pages • 2.5
#5 of 5 in Professor Challenger
1929 • 5 Readers • 48 pages • 4