00729cam a22002171  4500001001300000003000400013005001700017008004100034010001700075035002000092040001700112050001700129100003900146245009300185260007500278300001800353490008100371650002500452650001700477999001700494e  14002061 DLC20260227111202.0850304s1914    nyu           000 0 eng    ae  14002061   a(OCoLC)11760643  aDLCcAUdDLC00aHF5381b.A851 aAyres, Leonard Porter,d1879-1946.10aConstant and variable occupations and their bearing on problems of vocational education.  aNew York City,bDivision of Education, Russell Sage Foundationc[1914]  a11 p.c23 cm.0 a[Russell Sage Foundation, New York.  Division of Education.  Pamphlets] E136 0aVocational guidance. 0aOccupations.  c19747d19747