00453nam a2200121Ia 4500 140113s9999 xx 000 0 und d 378:331(047)(73) L1 National Academy of Sciences Mobility of Ph.D's before and after the doctorate with associated with economic & educational characteristics of states(Career Patterns Report No.3) 1971 National Academy of Science U.S.A. 200 BK 0 0 0 0 VTL VTL 2014-01-13 0 378:331(047)(73) L1 VBK1223 2014-01-13 00:00:00 2014-01-13 BK 57901 57901