Vortex 1: A Biodegradable Festival [Getty Images]

MILO MCIVER STATE PARK, OR - AUGUST 1970: Hippies attend the week long music festival Vortex 1: A Biodegradable Festival of Life in August 1970 in Milo McIver State Park in Clackamas County near Portland, Oregon. (Photo by Michael Ochs Archives/Getty Images)

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