Douglass, AE. 1922. ?Some Aspects Of The Use Of The Annual Rings In Trees In Climatic Study?. The Smithsonian Report For 1922. The Smithsonian Report For 1922.

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.