TY  - BOOK
AU  - Varentsov,I.M.
TI  - Sedimentary manganese ores 
U1  - 553.462 VAR  
PY  - 1964///.
CY  - Amsterdam : 
PB  - Elsevier Publishing Company, 
KW  - Sedementary rocks
KW  - Manganese ores
ER  -