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One important find in ACCF's natural/cultural history project this fall were air photos of the entire Alder-Jordan watershed dating from 1939. Here is a portion of a photo, including the SE part of PMF at left, with cleared field visible at lower left (though much greater in extent than at present due to natural reforestation). Note extensive harvesting of south-facing PMF slopes prior to 1939. Note also extensive orchard (primarily prune) agriculture east of PMF prior to settlement. This was the era in which orchard agriculture transitioned to timber processing as a major economic activity in Douglas County.