TY  - BOOK
AU  - Bower, W M 
AU  - Tarr, John C (Ed.)
TI  - Printing theory and practice : Mechanical typesetting 
PY  - 1947///
CY  - London: 
PB  - Sir ISAAC Pitman & Sons Ltd., 
KW  - Compositors equipment
KW  - Origins principles
ER  -