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- 25 West 6th Avenue Company (Helena, Mont.) 1
- A. M. Holter Hardware Company 1
- A. M. Holter and Brother 1
- Alaska--Commerce 1
- Alma & Virginia Consolidated Company 1
- Arizona--Industries 1
- Barbour, Marian Holter 1
- Barbour, Philip Richmond 1
- Bellingham Bay and Eastern Railroad Company 1
- Blackfoot Cattle Company 1
- Blue Canyon Coal Company 1
- Boulder (Mont.)--Commerce 1
- Boulder Valley Ditch Mining and Milling Company 1
- Building materials--Montana--Helena 1
- Butte (Mont.)--Commerce 1
- Capital Lanes, Inc 1
- Castle (Mont.)--Commerce 1
- Castle Land Company 1
- Cattle raising--Montana 1
- Coal mines and mining--Montana 1
- Copper mines and mining--Montana 1
- Corbin (Mont.)--Commerce 1
- Dams--Montana 1
- Deeks, Inc 1
- East Helena (Mont.)--Commerce 1
- Edelweiss Mining Company 1
- Electric power--Montana 1
- Elkhorn Mining Company (Elkhorn, Mont.) 1
- Elkhorn Mining Company (Ketchum, Idaho) 1
- Flour mills--Montana 1
- Frontier and pioneer life--Montana 1
- Gold mines and mining--Montana 1
- Graves Mercantile Company 1
- Great Falls (Mont.)--Comerce 1
- Hardware stores--Montana 1
- Hauser, Samuel Thomas, 1833-1914 1
- Helena & Frisco Mining Company 1
- Helena & Victor Mining Company 1
- Helena (Mont.)--Commerce 1
- Helena and Livingston Smelting and Reduction Company 1
- Helena and Rimini Mining Company 1
- Holter Company 1
- Holter Lumber Company 1
- Holter Realty Company 1
- Holter family 1
- Holter, Anton M., 1831-1921 1
- Holter, Aubrey M., 1883-1945 1
- Holter, Norman B., 1868-1957 1
- Holter, Norman J., 1914-1983 1
- Holter-Boorman Lumber Company 1
- Horse industry--Montana 1
- Idaho--Commerce 1
- Independent Coal and Coke Company 1
- Investments--Montana 1
- Iron mines and mining--Montana 1
- Jefferis family 1
- Judge Mining Company 1
- Judith Farms Company 1
- Kennett, Clara Holter 1
- Kennett, H. Percy, 1860-1900 1
- Land companies--Montana 1
- Little Ben Mining Company 1
- Lumber trade--Montana--Helena 1
- Lumber trade--Oregon 1
- Maginnis Mining Company 1
- Mines and mineral resources 1
- Mining machinery--Design and construction 1
- Missoula (Mont.)--Commerce 1
- Missouri River--Power utilization 1
- Monarch Mining and Power Company 1
- Montana Flour Mills Company 1
- Montana Lumber and Manufacturing Company 1
- Montana Power Company 1
- Murphy-Maclay Hardware Company 1
- N-Bar Ranch Company 1
- Norwegian Americans--Montana--Helena 1
- Pacific Coast and Norway Packing Company 1
- Parrot Silver & Copper Co 1
- Petroleum industry and trade--Montana 1
- Phosphate mines and mining--Montana 1
- Physicists--Montana 1
- Platinum mines and mining 1
- Rancho California Corporation 1
- Real estate business--Montana--Helena 1
- Retail trade--Montana 1
- Rimini (Mont.)--Commerce 1
- Rumley Mining Company 1
- Seven Devils Mining District (Idaho) 1
- Sheep ranches--Montana 1
- Silver mines and mining--Montana 1
- Smelting--Montana--East Helena 1
- Society of Montana Pioneers 1
- Street-railroads--Montana--Helena 1
- Stuart, Granville, 1834-1918 1
- Summit Mining Company 1
- United Missouri River Power Company 1
- Uranium mines and mining 1
- Virginia City (Mont.)--Commerce 1
- Walter Cooper Company 1
- Water-supply--Montana 1
- Wickes (Mont.)--Commerce 1
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- Silver mines and mining--Montana 12
- Mines and mineral resources--Montana 9
- Kootenai National Forest (Mont. and Idaho) 5
- Mine buildings 5
- Mineral industries 5
- Montana--Cabinet Mountains Wilderness 5
- Montana--Lincoln County 5
- Mine closures 2
- Mines and mineral resources 2
- Copper mines and mining--Montana 1
- Gold mines and mining--Montana 1
- Hecla Consolidated Mining Company (Mont.) 1
- Industrial chimneys--Montana 1
- Lead mines and mining--Montana 1
- Log buildings 1
- Log buildings--Montana 1
- Mines and mineral resources--Montana--Employees 1
- Smelting 1
- Zinc mines and mining--Montana 1
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