RT Journal Article SR Electronic T1 Canadian-trained physicians in United States internships and residencies: "Operation Retrieval" and Report of Statistics, 1966-1968 JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 291 OP 295 VO 102 IS 3 A1 Duff, S. L. A1 Fish, D. G. YR 1970 UL http://www.cmaj.ca/content/102/3/291.abstract