Biblio
“Physical Geography”. Tempe Normal School. Tempe Normal School.
. 1906. “Evidences Of Cycles In Tree Ring Records”. Proceedings Of The National Academy Of The Sciences. Proceedings Of The National Academy Of The Sciences.
. 1933. 
“Dendrochronology And Studies In Cyclics”. University Of Pennsylvania Bicentennial Conference Proceedings. University Of Pennsylvania Bicentennial Conference Proceedings.
. 
“Photograph Of Shadow Bands”. Astrophysical Journal LXIII (No. 3). Astrophysical Journal.
. 1926. 
“Precision Of Ring Dating In Tree-Ring Chronologies”. Tree Ring Bulletin XVII (No. 3). Tree Ring Bulletin .
. 1946. 
“A Hypothesis Regarding The Surface Markings Of Jupiter”. Popular Astronomy (No. 79). Popular Astronomy .
. 1900. 
“Steward Observatory”. Annual Report Of The University Of Arizona . Annual Report Of The University Of Arizona .
. 1939. “Altitudes And Locations”. Coconino Sun. Coconino Sun.
. 1901. “Astronomical Telegrams”. Publications Of The Astronomical Society. Publications Of The Astronomical Society.
. 1901. 
“The Missing November Meteor”. The Coconino Sun. The Coconino Sun.
. 1900. “How Tall We Are”. Coconino Sun. Coconino Sun.
. 1895. “Tree Rings And Climatic Cycles, Laboratory Of Tree-Ring Research, Astronomical Studies”. Phi Kappa Phi Journal. Phi Kappa Phi Journal. Tucson: University of Arizona.
. 1944. 
“Address At High School On Halleys Comet”. Tucson Citizen. Tucson Citizen.
. 1910. “Reports On The Conferences Of Cycles”. Washington, D.C. : Carneige Institution.
. 1929. 
“The Infatigable Astronomer”. The Journal Of Arizona History. The Journal Of Arizona History.
. 1978. “A.e. Douglass And The Canals Of Mars”. The Astronomy Quarterly 3 (No. 9). The Astronomy Quarterly.
. 1979.