comprising:
a) DETSKIE KNIGI. KATALOG IZDANIY [Children`s Books. Catalogue of Publications]. Moscow-Leningrad: GIZ, 1927. 16mo (190 x 135 mm), text in Russian, paperback, 139 pages, illustrated.
b) DETSKIE KNIGI [Children`s Books. Catalogue]. Moscow-Leningrad: GIZ, 1929. 16mo (190 x 135 mm), text in Russian, paperback, 280 pages, illustrated.