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Douglass, AE. 1933. Evidences Of Cycles In Tree Ring Records. Proceedings Of The National Academy Of The Sciences. Proceedings Of The National Academy Of The Sciences.
PDF icon Douglass, AE_Evidences of Cycles in Tree RIng Records_1933.pdf (11.71 MB)
O
Douglass, AE. 1915. An Optical Photograph. The Astrophysical Journal XLI (No. 3). The Astrophysical Journal.
PDF icon Douglass, AE_An Optical Photograph_1915.pdf (13.21 MB)