Biblio
“Reports On The Conferences Of Cycles”. Washington, D.C. : Carneige Institution.
. 1929. Carnegie Institution of Washington_Reports on the Conferences of Cycles_1929.pdf (31.03 MB)“Dendrochronology And Studies In Cyclics”. University Of Pennsylvania Bicentennial Conference Proceedings. University Of Pennsylvania Bicentennial Conference Proceedings.
. Douglass, AE_Dendrochronology and Studies in Cyclics.pdf (21.08 MB)“Dendrochronology And Studies In Cyclics”. University Of Pennsylvania Bicentennial Conference. University Of Pennsylvania Bicentennial Conference.
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