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Colorado Aurora 1915 4b-bar 1908-1939 PC. Adams county. CO150430 $10.00
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Colorado Denver, Colo. International Dry-Farming Congress and Exposition Denver Sept. 27-Oct. 9 1915 Slogan 1915 International Machine Type D42 PC. Denver county. CO150505 $10.00
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Colorado Denver, Colo. International Dry-Farming Congress and Exposition Denver Sept. 27-Oct. 9 1915 Slogan 1915 International Machine Type D42 1c Green Jefferson Postal Card to Canada. Denver county. CO150702 $10.00
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Colorado Denver, Colo. International Dry-Farming Congress and Exposition Denver Sept. 27-Oct. 9, 1915 Slogan International Machine D42db PPC (State Capitol from Sherman Avenue, Denver, Colo.). Denver county. CO150712 $10.00
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Colorado Denver, Colo. International Dry-Farming Congress and Exposition Denver Sept. 27-Oct. 9 1915 Slogan 1915 International Machine Type D42 PC Small tear at right. Denver county. CO150721 $10.00
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Colorado Olathe 1915 duplex PC Some edge wear. Montrose county. CO151020 $10.00
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Colorado Grant 1915 4b-bar 1871-1918 PC. Park county. CO151220 $20.00
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Colorado Cotopaxi 1915 4a-bar PC crease. Fremont county. CO151221 $10.00
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Colorado Brush 1916 duplex PPC (Sanatorium, Brush, Colo.) Creases. Morgan county. CO160525 $15.00
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Colorado Denver, Colo. New Rocky Mountain National Park Opens May-1st 1916 Slogan 1916 International Machine Type D42 PPC (View of Denver from D. & F. Tower). Denver county. CO160721 $10.00
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Colorado Denver, Colo. New Rocky Mountain National Park Opens May-1st 1917 Slogan International Machine Type D42 PC. Denver county. CO160923 $10.00
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Colorado Denver, Colo. 1917 New Rocky Mountain National Park Opens May-1st 1917 Slogan International Machine Type D42 1c Washington Franklin (2) to Canal Zone Corner card J.J. Wiliamson Company, Men's Outfitters. Denver county. CO170505 $15.00
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Colorado Denver, Colo. Rocky Mountain National Park Opens May-1st 1917 Slogan 1917 International Machine Type D42 PPC (Looking Down 17th Street - Denver, Colo.). Denver county. CO170506 $10.00
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Colorado Denver, Colo. New Rocky Mountain National Park Opens May-1st 1917 Slogan International Machine Type D42 PC crease. Denver county. CO170622 $10.00
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Colorado Denver, Colo. New Rocky Mountain National Park Opens May-1st 1917 Slogan 1917 International Machine Type D42 PPC (State Capitol and Grounds, Denver, Colo.) Crease. Denver county. CO170714 $10.00
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Colorado Moraine Park 1919 4a-bar 1902-1921 PC. Larimer county. CO170730 $15.00
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Colorado Denver, Colo. New Rocky Mountain National Park Opens May-1st 1917 Slogan International Machine Type D42 PC. Denver county. CO170807A $10.00
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Colorado Denver, Colo. New Rocky Mountain National Park Opens May-1st 1917 Slogan 1917 International Machine Type D42 PPC (Gas and Electric Building at Night, Denver, Colo. Best Lighted Building in the World.) Edge wear. Denver county. CO170909 $10.00
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Colorado Denver, Colo. New Rocky Mountain National Park Opens May-1st 1917 Slogan 1917 International Machine Type D42 PC. Denver county. CO171003 $10.00
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Colorado Denver, Colo. New Rocky Mountain National Park Opens May-1st 1917 Slogan 1917 International Machine Type D42 PC. Denver county. CO171019 $10.00
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