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Horn, Kennedy
From the text... 'Because maize is a plant that requires human cultivation for survival, we can infer from the distribution of maize pollen that sedentary agriculturalists were present at La Selva by 2700 B.P. This interpretation is consistent with…
Type: Document
Year: 2001
Ferguson
[From first paragraph] Dendrochronology may be defined as the study of the chronological sequence of annual growth rings in trees. The concepts and techniques of the science, as presented here, reflect the work and practice of the Laboratory of Tree…
Type: Document
Year: 1970