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- Military maps1
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- Oils and fats1
- Paraguayan War, 1865-18701
- Petroleum1
- Piers1
- Ponds1
- Portage Lake (Houghton County, Mich.)1
- Railroad land grants1
- Real property1
- Reclamation of land1
- Reefs1
- Reservoirs1
- Rivers1
- Silver mines and mining1
- Storm sewers1
- Torch Lake (Houghton County, Mich.)1
- Wetlands1
