Twin-Fin Surfing, 1970Credits: Hal Jepsen, John SeversonEncyclopedia of Surfingtwin-finCarroll, CorkyRiddle, JHistory of SurfingTwo Fins, More WinsInterviewsCorky CarrollJ RiddleFeaturesTWIN-FINS: YOU SPIN ME RIGHT ROUNDMARK RICHARDS: "NOT PRETTY, BUT PLENTY RADICAL"The Sunday JointSUNDAY JOINT, 8-12-2018: MARK RICHARDS AND THE TWIN-FINVideosFaster Twin-Fin! Kill! Kill!Twin-Fin Surfing, Early '80sCorky Carroll, 1970 Twin-Fin Session, Cottons PointMark Richards