TY -
BOOK
AU - Gardner, E. D.
AU - Johnson, J. Fred
TI -
Shaft sinking practices and costs
PB - U.S. Gov. Print. Off.
PY - 1932
BT - Bulletin / US Department of the Interior, Bureau of Mines ; 357
CY - Washington
UR - http://slubdd.de/katalog?TN_libero_mab2
ER -