TY  - BOOK
AU  - Rad,Parviz F.
ED  - United States.
TI  - Mechanical properties and cutting characteristics of coal
U1  -  621 
PY  - 1973///
CY  - Washington, D. C.
PB  - Uniteds States Government Printing Office
KW  - Mechanical engineering
KW  - Mechanical movements
N1  - Bureau of mines
ER  -