1928 96 p., several figs, 4 pls, 1 map, paperbound (modern plain covers). Published in: Annals of the South African Museum. Ex library Dr. A.C. van Bruggen (with his stamp). Scarce.
n.d Annals of the South African Museum, vol. XXV, part. 1, s.d. : In-8 Raisin, Broché. tiré-à-part, 75 pp., 4 planches N&B hors-texte, traite des araignées, solifuges et scorpions Parfait état, Couv. convenable, Dos abîmé, Intérieur frais.