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[17-12] Monthly Report [for Yellowstone National Park] for December, 1917.
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[18-01] Monthly Report [for Yellowstone National Park] for January, 1918.
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[18-02] Monthly Report [for Yellowstone National Park] for February, 1918.
template is PDF
[18-03] Monthly Report [for Yellowstone National Park] for March, 1918.
template is PDF
[18-04] Monthly Report [for Yellowstone National Park] for April, 1918.
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[18-05] Monthly Report [for Yellowstone National Park] for May, 1918.
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[18-06] Monthly Report [for Yellowstone National Park] for June, 1918
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[18-09] [Monthly Report for Yellowstone National Park for September 1918]
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[18-10] [Monthly Report for Yellowstone National Park for October 1918]
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[18-11] [Monthly Report for Yellowstone National Park for November 1918]
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[18-12] [Monthly Report for Yellowstone National Park for December 1918]
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[19-01] [Monthly Report for Yellowstone National Park for January 1919]
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[19-02] [Monthly Report for Yellowstone National Park for February 1919]
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[19-03] [Monthly Report for Yellowstone National Park for March 1919]
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[19-04] [Monthly Report for Yellowstone National Park for April 1919]
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[19-05] Monthly Report [for Yellowstone National Park] For May, 1919.
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[19-06] Monthly Report [for Yellowstone National Park] For June, 1919.
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[19-07] Monthly Report [for Yellowstone National Park] for July, 1919.
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[19-08] Monthly Report [for Yellowstone National Park] for August, 1919.
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[19-09] Monthly Report [for Yellowstone National Park] for September, 1919.
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[19-10] Monthly Report [for Yellowstone National Park] for October, 1919.
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[19-11] Monthly Report [for Yellowstone National Park] for November, 1919.
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[19-12] Monthly Report [for Yellowstone National Park] for December, 1919.
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[20-01] Monthly Report for [Yellowstone National Park] January, 1920.
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[20-02] Monthly Report for [Yellowstone National Park] February, 1920.
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[20-03] Monthly Report for [Yellowstone National Park] March, 1920.
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[20-04] Monthly Report for [Yellowstone National Park] April, 1920.
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[20-05] Monthly Report for [Yellowstone National Park] May, 1920.
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[20-06] Monthly Report for [Yellowstone National Park] June, 1920.
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[20-07] Monthly Report for [Yellowstone National Park] July, 1920.
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[20-08] Monthly Report for [Yellowstone National Park] August, 1920.
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[20-09] Monthly Report for [Yellowstone National Park] September, 1920.
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[20-10] Monthly Report for [Yellowstone National Park] October, 1920.
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[20-11] Monthly Report for [Yellowstone National Park] November, 1920
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[20-12] Monthly Report for [Yellowstone National Park] December, 1920.
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[21-01] Monthly Report for [Yellowstone National Park] January, 1921.
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[21-02] Monthly Report for [Yellowstone National Park] February, 1921.
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[21-03] Monthly Report For [Yellowstone National Park] March, 1921.
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[21-04] Monthly Report For [Yellowstone National Park] April, 1921.
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[21-05] Monthly Report, [for Yellowstone National Park] May, 1921.
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[21-06] June Monthly Report [for Yellowstone National Park] 1921.
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[21-07] Monthly Report For [Yellowstone National Park] July, 1921.
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[21-08] August Monthly Report-----1921 [for Yellowstone National Park].
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[21-09] Monthly Report for [Yellowstone National Park] September,1921.
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[21-10] Monthly Report For [Yellowstone National Park] October, 1921.
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[21-11] Monthly Report [for Yellowstone National Park] Nov. 1921.
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[21-12] Monthly Report of Yellowstone National Park December, 1921.
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[22-01] (Monthly Reports) [for Yellowstone National Park] January 1922
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