00697nam a2200193 a 450000500170000000800410001703500150005804100070007305000200008010000140010024501150011426000750022930000120030444000780031665000270039465000410042170000190046270000220048120260818224304.0                                          a.b106720720 aEN  aTE7 R63 no. 816  aHeath, W. 0aTerrestrial photogrammetric surveys of unstable terrain in Colombia /b..., L. L. Parsley and J. W. F. Dowling  aCrowthorne, Berkshire :bTransport and Road Research Laboratory,c1978  a39, 1 p 0aTransport and Road Research Laboratory. TRRL Laboratory report ;vno. 81610aPhotographic surveying10aAerial photography in road surveying  aParsley, L. L.  aDowling, J. W. F.