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Subject
- Military engineering794
- Military engineers384
- Electronics in military engineering287
- History213
- United States. Army. Corps of Engineers142
- Fortification138
- United States103
- Federal receipts and expenditures97
- Financial statements96
- United States. War Dept. Engineer Dept76
- Military art and science67
- United States. Army67
- Coast defenses66
- Harbors and ports66
- Armed Forces64
- Navigation improvements64
- Hydrographic surveying62
- Bridges60
- Rivers, creeks, streams, etc59
- Military construction54