Scientific report High Altitude Observatory (HAO) ; no. 1. AFCRL-63-660. Abstract: Forty scholars from the fields of meteorology, geography, geology, biology, anthropology, and history participated in a conference at Aspen, Colorado, June 16-24, 1962, to present and assess data from their respective disciplines pertaining to the climates of the eleventh and sixteenth centuries, A. D. General decadal comparisons of the climates for the Northern Hemisphere in the latter half of the two centuries proved feasible with the data available. The participants agreed upon parameters most valuable to an historical assessment of climate, possible additional sources of data, and means of further interdisciplinary cooperation. It was also concluded that a repository for pertinent information should be established and that another assessment of available evidence should be made within five years. Recommendations of the participants, but not individual presentations of data, are presented in this report.
