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Subject
- Navigation improvements[remove]49
- Rivers, creeks, streams, etc45
- United States. Mississippi River Commission41
- Levees40
- Federal receipts and expenditures39
- Financial statements39
- Hydrographic surveying37
- Water levels36
- Dredging33
- Flood control31
- Harbors and ports28
- Channels (Hydraulic engineering)26
- Construction24
- Laws and legislation22
- Aqueducts21
- Public buildings21
- Monuments and memorials20
- United States. War Dept. Engineer Dept18
- Grounds maintenance17
- United States. Army. Corps of Engineers17