TY  - BOOK
AU  - Ayres,Leonard Porter
TI  - Constant and variable occupations and their bearing on problems of vocational education
T2  - [Russell Sage Foundation, New York.  Division of Education.  Pamphlets] E136
AV  - HF5381 .A85
PY  - 1914///]
CY  - New York City
PB  - Division of Education, Russell Sage Foundation
KW  - Vocational guidance
KW  - Occupations
ER  -