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Primary view of Cutoff Trench
Breitenstein, Frank C.
August 1, 1941
Primary view of Crews Hand Tamping
Breitenstein, Frank C.
August 1, 1941
Primary view of Picture of Progress
Breitenstein, Frank C.
August 1, 1941
Primary view of East Dike
Breitenstein, Frank C.
August 1, 1941
Primary view of Carryall Units
Breitenstein, Frank C.
August 1, 1941
Primary view of Inside of Field Laboratory
Breitenstein, Frank C.
August 1, 1941
Primary view of Inside of Field Laboratory
Breitenstein, Frank C.
August 1, 1941
Primary view of Inside of Field Laboratory
Breitenstein, Frank C.
August 1, 1941
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