TY  - BOOK
ED  - Geological Survey of Canada
TI  - Helicopter operations of the Geological Survey of Canada
T2  - Its Bulletin
AV  - QE185 .A43 no. 54
PY  - 1959///]
CY  - [Ottawa]
PB  - Dept. of Mines and Technical Survey, Canada
KW  - Helicopters
KW  - Geology
KW  - Fieldwork
KW  - Canada
KW  - Maps
KW  - Photographic surveying
KW  - Surveys
N1  - Abstract in English and French; Includes bibliographies
ER  -