TY  - BOOK
AU  - Strickland, W. H.
AU  - King, Robert H.
CN  - I 28.23:
CN  - TN23
CN  - TN345
CY  - Washington, D.C. :
DA  - 1993.
ID  - 184685
KW  - Mining machinery
KW  - Sonar.
N1  - Distributed to depository libraries in microfiche.
N1  - Shipping list no.: 93-0811-M.
PB  - U.S. Dept. of the Interior, Bureau of Mines,
PP  - Washington, D.C. :
PY  - 1993.
T1  - Characteristics of ultrasonic ranging sensors in an underground environment
TI  - Characteristics of ultrasonic ranging sensors in an underground environment
VL  - 9452
ER  -