Breeding bees according to the modern principles of beekeeping with special attention to the management in American hives, i.e., over-bar hives - Ludwik Weber, Lvov 1920, H. Altenberg, G.Seyfarth, E.Wende and Ska, f. 14 x 20.5cm, pp. XI, 360
numerous illustrations in the text
hardcover, pp.