TY  - BOOK
ED  - THE AMERICAN SOCIETY OF PHOTOGRAMMETRY
TI  - Photogrammetric Engineering, V-37, No. 1 JANUARY 1971
U1  - 621.120 
PY  - 1971///
CY  - VIRGINIA
PB  - THE AMERICAN SOCIETY OF PHOTOGRAMMETRY
KW  - PHOTOGRAMMETRIC ENGINEERING
ER  -