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Septic tanks
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[remove]
22
Civilian Conservation Corps (U.S.)
14
Architectural drawings
8
Sewage disposal
8
Cabins
6
Park buildings
3
Camp sites, facilities, etc
2
Parks
2
Picnic grounds
2
Segregation--United States
2
Bathhouses
1
Biological stations
1
Cesspools
1
Dwellings
1