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Sadajiro Tsuchida － 土田 定次郎 (1908-1976)
Sadajiro.Tsuchida (土田 定次郎, 1908-1976), was a Japanese paleontologist and petroleum geologist.
A scanned image of one of his early writings, "Ore deposits of Chosen (Korea)," has been opened online. One of his grandchildren, TK, transcribed the original text into electronic text, added annotations such as the location on topographic maps to it, and is distributing as a PDF file as "Re-edited Version of Ore deposits of Chosen (Korea)".