Rotterdam, van Hengel, 1911. [viii], 237, [iii], 20 [viii] pp. 4to. Original marbled boards (spine sl. dam.; 1 hinge worn). With 126 illustrations and an atlas of 28 plates.
Prize essay, crowned with gold, and a classic comparative study on the fetal monster with two heads. --(Nwe. Verh. Bataafsch Gen. 2e reeks: VI, 3).
Amsterdam, Noord-Hollandsche Uitgeversmaatschappij, tweede druk, April 1983, in-8°, 385 pp, softcover.