TY  - BOOK
AU  - Orford,Henry
AU  - Lockett,Arthur
TI  - Lens-work for amateurs,
AV  - QC385 .O6 1931
U1  - 681.42 
PY  - 1931///
CY  - London, New York [etc.]
PB  - Sir I. Pitman & sons, ltd.
KW  - Lenses
ER  -