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200 10$aPatterns of ambulatory care in general and family practice : the National Ambulatory Medical Care Survey, United States, January 1980-December 1981
210   $cU.S. Department of Health and Human Services, Public Health Service, National Center for Health Statistics$aHyattsville, Md
517   $aPatterns of ambulatory care in general and family practice 
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996   $aPatterns of ambulatory care in general and family practice : the National Ambulatory Medical Care Survey, United States, January 1980-December 1981$93334709
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