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Box 06, Slide 32 Schoolboys waiting for their turn to play ping-pong in a classroom. American visitors standing in front of a blackboard. Drawing on the blackboard explains the types of spins in ping-pong. Posters on the wall read "How to prevent myopia. (怎样预防近视.)" and "Illustration of eye exercises. (眼保健操图解.)" Summer, 1973. UC San Diego Library, UC San Diego, La Jolla, 92093-0175 (https://library.ucsd.edu/dc/contact)