TY  - BOOK
ED  - International Labour Office
ED  - International labor conference
TI  - Hours of work in coal mines: Item II on the agenda
AV  - HD5119.M6 I5 1930b
U1  - 331.8182233 
PY  - 1930///
CY  - Geneva
PB  - International labour office
KW  - Coal mines and mining
KW  - Hours of labor
KW  - Coal miners
N1  - At head of title: Questionnaire. International labour conference. Fifteenth session. Geneva--May, 1931
ER  -