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1845, J C Frémont, Report of the Exploring Expedition to the Rocky Mountains in the Year 1842, and to Oregon and North California in the Years 1843-’44, Washington: Gales and Seaton, →LCCN, →OCLC, page 21:
We crossed during the morning a number of hollows, timbered principally with box elder, (acer negundo,) poplar, and elm.