TY  - BOOK
AU  - Heath, W.
AU  - Parsley, L. L.
AU  - Dowling, J. W. F.
TI  - Terrestrial photogrammetric surveys of unstable terrain in Colombia: ..., L. L. Parsley and J. W. F. Dowling
AV  - TE7 R63 no. 816 
PY  - 1978///
CY  - Crowthorne, Berkshire
PB  - Transport and Road Research Laboratory
KW  - Photographic surveying
KW  - Aerial photography in road surveying
ER  -