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PERRY NW Jr, COPENHAVER RM.PERRY NW Jr, et al. Among authors: copenhaver rm.Percept Mot Skills. 1965 Jun;20:SUPPL:1209-13. doi: 10.2466/pms.1965.20.3c.1209.Percept Mot Skills. 1965.PMID: 14329678No abstract available.