Otis Adelbert Kline

A very well recieved series by Otis Adelbert Kline are the books, featuring tropes. The most popular books are Robert Grandon 02 Prince of Peril, Maza of the Moon (1929), Dr. Dorp 01 The Malignant Entity, Robert Grandon 01 Planet of Peril, Robert Grandon 03 The Port of Peril aka Buccaneers of Venus, Bride of Osiris, SPAWN OF THE COMET, Maza of the Moon, The Metal Monster, Stolen Centuries, The Swordsman of Mars, Revenge of the Robot, The Thing That Walked In The Rain, Jan of the Jungle, which was published in 2022.