TY  - GEN
AU  - Camble,William ,ed
TI  - Penroses annual:the process yearbook -vol-xxi
U1  - 605 
PY  - 1916///
CY  - s.l.
PB  - s.n.
KW  - Manufacture-periodicals
KW  - Technology
N1  - Vol-XXI
ER  -