In russian: middle Meocene (Chokrak-Karagan) sandstones.
GOLD CONTENT OF THE MIDDLE MIOCENE PLACER IN THE EASTERN CAUCASUS SUBPROVINCE (DAGHESTAN BORDER FRAME) // Issue 50, P. 19 - 25.
CHERKASHIN Vasily Ivanovich
MATSAPULIN Vladimir Ustimovich
YUSUPOV Akha Ramazanovich
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