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 Colorado Denver, Colo. Be Careful with Fire in the Mountains Slogan 1919 Universal Machine Type DT400 PPC (Typical Western Ranch). Denver county. CO190812 $15.00
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 Colorado Denver Colo. Vacation Outdoors in Colorado's National Forests Slogan 1919 Universal Machine Type DT1L400 PC. Denver county. CO190929 $10.00
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 Colorado Denver, Colo. Join the Navy Training-Travel Slogan 1920 Universal Machine Type DT2L400. Denver county. CO200607 $10.00
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 Colorado Pine 1921 4b-bar 1919-1960 PC. Jefferson county. CO210328 $10.00
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 Colorado Tennessee Pass 1922 4c-bar 1912-1960 PPC (Canopy Hall, Cave of the Winds, Manitou, Colo.). Lake county. CO220916 $10.00
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 Colorado Tennessee Pass 1922 4c-bar 1912-1960 PPC (Going Through the Royal Gorge, Colo.). Lake county. CO220916A $10.00
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 Colorado Malta 1922 4b-bar 1890-1955 PC reduced at left. Lake county. CO221111 $10.00
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 Colorado ColoradoSprings, Colo. National Cancer Week Nov. 12-20 Slogan 1922 Universal Machine Type BT400 Postcard. El Paso county. CO221114 $15.00
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 Colorado Tennessee Pass 1913 4c-bar 1912-1960 PPC (Lower Entrance to Royal Gorge, Colo. Looking West). Lake county. CO230715 $10.00
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 Colorado Tennessee Pass 1923 4b-bar 1912-1960 PPC (Clear Creek from Coloraw Point, Lookout Mountain, Colo.). Lake county. CO230922 $10.00
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 Colorado Tennessee Pass 1923 4c-bar 1912-1960 PC. Lake county. CO230922A $10.00
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 Colorado Julesburg, Colo. 1924 Columbia Machine Type G2Wd1. Sedgwick county. CO240501 $10.00
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 Colorado Julesburg, Colo. 1924 Columbia Machine Type G2Wd1. Sedgwick county. CO240823 $10.00
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 Colorado Wray, Colo. 1925 Columbia Machine Type G1W PPC (Birdseye View of Wray, Colo.). Yuma county. CO250929 $15.00
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 Colorado Tennessee Pass 1926 4b-bar 1912-1960 PPC (In the Royal Gorge, Grand Canyon of the Arkansas, Colo., Denver & Rio Grande Western Railroad). Lake county. CO260821 $10.00
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 Colorado Estes Park c1926 American Flag Type A14 PC Crease. Larimer county. CO260916 $25.00
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 Colorado Denver 1927 machine 1c Green Jefferson Postal Card Reverse Printed Advertising Macon & Co., Inc. offering oil well interests. Denver county. CO270322 $10.00
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 Colorado Denver 1927 machine 1c Green Jefferson Postal Card Reverse Printed Advertising Notice of Withdrawal of Ruby Oil Offering by Macon & Co., Inc. Denver county. CO270326 $10.00
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 Colorado Denver 1927 machine 1c Green Jefferson Postal Card Reverse Printed Advertising Macon & Co. Offering Shares in Ruby Oil. Denver county. CO270707 $10.00
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 Colorado Julesburg, Colo. 1927 Columbia Machine Type G2Wd1. Sedgwick county. CO270911 $10.00
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