TY  - GEN
AU  - Edgertgon,Curtis D.
ED  - United States.
TI  - The mine map repository: a source of mine data 
T2  - Information circular
PY  - 1974///]
CY  - [Washington]
PB  - U.S. Dept. of the Interior, Bureau of Mines
KW  - Mine maps
ER  -