TY  - BOOK
AU  - Trumbull,L.W.
TI  - A manual of underground surveying,
SN  - 31924004585588
U1  - 622.1 22
PY  - 1910///
CY  - New York [etc.]
PB  - McGraw-Hill Book Co.
KW  - Mine surveying
N1  - Bibliography at end of most of the chapters
ER  -