( 1) Field Investigators Comments
F1 GHP 16-AUG-65
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( 2) General reference
DOE (IAM) AMs Eng 2 1978 123
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(3) Vertical aerial photograph reference number
RAF 540/860 4040-1 02-SEP-1952
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(4) Vertical aerial photograph reference number
RAF 543/2821 274-5 27-APR-1964
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