TY  - BOOK
AU  - Opeka,Timothy
AU  - Morse,Ronald
TI  - Use of green-manure amendents and tillage to improve minesoil productivity
U1  - 622 
PY  - 1979///
CY  - Washington
PB  - United States Government Printing Office
KW  - Mining engineering
KW  - Mining machinery
ER  -