TY  - BOOK
ED  - American Congress on Surveying and Mapping. Washington
TI  - Papers from the 31st annual meeting
U1  - 526.906373 
CY  - Washington
PB  - ACSM
KW  - Surveying
N1  - Meetings held on March 7-12, 1971 and September 7-11, 1971
ER  -