24 Farbentafeln

1933. UNESMA. 24 Farbentafeln. 28 pp. text, illustrated with 24 loose colour diagrams. Small oblong 8vo, 105 x 145 mm., text bound in publisher's wrappers, all together loose within publisher's tan card chemise, in a new cloth folding box. [Leipzig: Verlag Unesma, 1933]. A charming and quite rare work on colour theory based on the work of Wilhelm Ostwald. OCLC lists only the Yale copy in the U.S. and 2 copies in Europe.