University of Illinois Urbana-Champaign

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Thumbnail for The expeditions of John Charles Frémont. Volume 1: Travels from 1838 to 1844
The expeditions of John Charles Frémont. Volume 1: Travels from 1838 to 1844
Frémont, John Charles; Jackson, Donald Dean; Spence, Mary Lee

Thumbnail for Food for thought:  Lower than expected crop yield stimulation with rising carbon dioxide concentrations.
Food for thought: Lower than expected crop yield stimulation with rising carbon dioxide concentrations.
Long, S.P.; Ainsworth, E.A.; Leakey, A.D.B.; Nosberger, J.; Ort, D.R.

Thumbnail for Additional Content
Additional Content
Submitter: Howard Ding