@conference {709,
	title = {Tree Growth and Solar Cycles},
	booktitle = {Paper Presented at International Research Council},
	year = {1931},
	note = {Copies of this are available through the Tree Ring Laboratory. Please contact the curator for more information. pcreasman@ltrr.arizona.edu},
	keywords = {astronomy, Douglass, historic, solar cycles, tree growth},
	author = {Douglass, A.E.}
}
