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Professor Challenger is a 4-book series with 4 primary works first released in 1900 with contributions by Arthur Conan Doyle.
1900 • 74 Readers • 348 pages • 3.7
1913 • 2 Readers • 152 pages • 2.5
1928 • 2 Readers
The Disintegration Machine
1929 • 2 Readers • 48 pages