1959
Index: U.S.S.R. Leningrad, U
World Atlas
(Index to) U.S.S.R. Leningra
U.S.S.R. Leningrad, Ural. Pl
U.S.S.R. Leningrad, Ural. Th
Composite: U.S.S.R. Kamchatk
(Composite of) Plates 39, 41