TY  - BOOK
ED  - THE AMERICAN SOCIETY OF CIVIL ENGINEEERS
TI  - Journal of the Surveying and Mapping Division Vol. 97, 1971
U1  - 624.105 
PY  - 1971///
CY  - NEW YORK
PB  - THE AMERICAN SOCIETY OF CIVIL ENGINEEERS
KW  - SURVEYING AND MAPPING
ER  -