00486nam a2200145 a 450000500170000000800410001703500150005805000200007310000200009324500620011326000490017530000140022444000680023865000340030620260817161759.0                                          a.b10057985  aQE75 P9 no. 373  aRay, Richard G. 0aAerial photographs in geologic interpretation and mapping  aWashington :bU. S. Govt. Print. Off.,c1960  avi, 230 p 0aUnited States. Geological Survey. Professional paper ;vno. 373 0aAerial photography in geology