Who took these mysterious Summer of Love era photos?

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An unknown photographer embedded themself in the San Francisco protests in the late '60s, getting up close to famous figures like Mohammed Ali, Jerry Garcia, Timothy Leary and Carlos Santana. Their collection now belongs to American photographer Bill Delzell, who's trying to figure out who took them. The answer could lie in dozens of rolls of film that were never developed. Canadian archivist Gerald Freyer hopes to reveal their secrets.