http://book.klll.cc/ebooks/author/36931.opds?sort_order=title 2025-11-15T06:09:53Z Books by Johannsen, O. A. (Oskar Augustus) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-15T06:09:53Z https://en.wikipedia.org/wiki/Oskar_Augustus_Johannsen See also: en.wikipedia 2025-11-15T06:09:53Z https://book.klll.cc/ebooks/34279.opds Handbook of Medical Entomology William A. Riley and O. A. Johannsen