Paul Gutmann. El Retorno Del Hombre De Las Cavernas. Translated from German into Spanish by Elsa Volk-Friedland and Ramon G. Colim.

<<First Spanish edition.>> Original color illustrated wrappers and black-and-white frontispiece illustration by the Mexican artist <<Francisco Eppens Helguera.>> pp. 127. Browned. Light wear to covers. 8vo.

México: Editorial Surco del Sindicato Mexicano de Electricistas 1942