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Douglass, AE. 1901. Altitudes And Locations. Coconino Sun. Coconino Sun.
Tomlinson, George. 1983. Air Pollutants And Forest Decline. Environmental Science Technology 17 (No. 6). Environmental Science Technology.
Webb, GE. 1979. A.e. Douglass And The Canals Of Mars. The Astronomy Quarterly 3 (No. 9). The Astronomy Quarterly.
unknown,. 1910. Address At High School On Halleys Comet. Tucson Citizen. Tucson Citizen.