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1by ︠I︡Akovlev, Mikhail Semenovich
Published 1960Moskva : Izd-vo Akademii nauk SSSR, 1960.155 p. : ill., map, ports. ; 21 cm.“...Nauchno-popul︠i︡arna︠i︡a seri︠i︡a / Akademi︠i︡a nauk SSSR....”
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2by Kalashnikov, V. P. (Viktor Petrovich)
Published 1957Moskva, Izd-vo Akademii nauk SSSR, 1957.142 p. illus., fold. map. 20 cm.“...Nauchno-popul︠i︡arna︠i︡a seri︠i︡a / Akademi︠i︡a nauk SSSR....”