Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].

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CINEMATOGRAPHIC SUPPLEMENT Films i to 12 To flicker Films i, 2, 3, 7, 8 and 9, hold section in left hand and flick outer edge with right thumb. To flicker Films 4, 5, 6, 10, 11 and 12, hold section in right hand and flick outer edge with left thumb.