Viatka Kama

THE BRITISH SULPHUR CORP. LTD., 1980: WORLD SURVEY OF PHOSPHATE DEPOSITS, 4TH ED., LONDONKARPOVA, M.I., VARFOLOMEYEVA, YE.K., 1976: MINERAL CHARACTERISTICS OF PHOSPHORITES FROM EASTERN USSR AND THE URALS. INT. GEOL. REVIEW, VOL.18, NO.12, P.1440-1452POLYANIN, V.A., ET AL., 1973: PHOSPHORITE FORMATIONS OF THE VYATKA KAMA BASIN, (RUSSIAN). IZDAT. KAZAN UNIVERSITY, 1973MIKHAYLOV, A.S., 1984: PHOSPHORITES, (RUSSIAN); IN: PETROV, V.P. (EDITOR), NONMETALLIC USEFUL RAW MATERIALS OF THE USSR, MOSCOV, NEDRA, 1984BELINKO, G. DE, 1981: EXPLOITATION DES PHOSPHATES EN UNION SOVIETIQUE. INDUSTRIE MINERALE, OCTOBRE 1981, P.592-596CHETYRKINA, A.A. AND SHUGIN, A.A., 1937: GEOLOGICAL DESCRIPTION OF THE VJATKA KAMA PHOSPHORITE BEARING AREA; IN: GEOL. INVESTIGATIONS OF AGRICULTURAL ORES USSR. TRANSACT. SCI. INST. FERTILIZER AND INSECT. FUNGICIDES. NO.142, 1937