Dudeney, Henry Ernest, 1857-1930. 536 puzzles & curious problems. [electronic resource] / Edited by Martin Gardner.. — New York, : Scribner, [1967]. — xii, 428 p. : illus. 23 cm. LCCN: 67015488 Subjects--Topical Terms: Mathematical recreations.Puzzles. LC Class. No.: QA95 / .D83 Dewey Class. No.: 793.7/4