[17-12] Monthly Report [for Yellowstone National Park] for December, 1917.

[18-01] Monthly Report [for Yellowstone National Park] for January, 1918.

[18-02] Monthly Report [for Yellowstone National Park] for February, 1918.

[18-03] Monthly Report [for Yellowstone National Park] for March, 1918.

[18-04] Monthly Report [for Yellowstone National Park] for April, 1918.

[18-05] Monthly Report [for Yellowstone National Park] for May, 1918.

[18-06] Monthly Report [for Yellowstone National Park] for June, 1918

[18-09] [Monthly Report for Yellowstone National Park for September 1918]

[18-10] [Monthly Report for Yellowstone National Park for October 1918]

[18-11] [Monthly Report for Yellowstone National Park for November 1918]

[18-12] [Monthly Report for Yellowstone National Park for December 1918]

[19-01] [Monthly Report for Yellowstone National Park for January 1919]

[19-02] [Monthly Report for Yellowstone National Park for February 1919]

[19-03] [Monthly Report for Yellowstone National Park for March 1919]

[19-04] [Monthly Report for Yellowstone National Park for April 1919]

[19-05] Monthly Report [for Yellowstone National Park] For May, 1919.

[19-06] Monthly Report [for Yellowstone National Park] For June, 1919.

[19-07] Monthly Report [for Yellowstone National Park] for July, 1919.

[19-08] Monthly Report [for Yellowstone National Park] for August, 1919.

[19-09] Monthly Report [for Yellowstone National Park] for September, 1919.

[19-10] Monthly Report [for Yellowstone National Park] for October, 1919.

[19-11] Monthly Report [for Yellowstone National Park] for November, 1919.

[19-12] Monthly Report [for Yellowstone National Park] for December, 1919.

Yellowstone National Park Heritage and Research Center