100 great problems of elementary mathematics their history and solution - Dörrie, Heinrich 1873-1955 (Dover Publ., 1965)
"A new translation of the unabridged text of the fifth edition ... published by the Physica-Verlag, Würzburg, Germany, in 1958 under the title Triumph der Mathematik: Hundert berühmte Probleme aus zwei Jahrtausenden mathematischer Kultur."