Douglass, AE. 1922. ?Some Topographic And Climatic Characters In The Annual Ring Of The Yellow Pines And Sequoias Of The Southwest ?. Proceedings Of The American Philosophical Society LXI (No. 2). Proceedings Of The American Philosophical Society.

Douglass, AE. 1920. ?Evidence Of Climatic Effects In The Annual Rings?. Ecology 1 (No. 1). Ecology.