TY  - BOOK
ED  - British Standards Institution.
TI  - Methods for the determination of particle size of powders, Part 4: Optical microscope method 
T2  - British standard 
U1  - 620.43 22
PY  - 1963///
CY  - London
PB  - [publisher not identified]
KW  - Particle size determination
KW  - Powders
KW  - Microscopy
KW  - Microscope and microscopy
N1  - Cover title; "B.S. 3506: Part 4: 1963"; Photocopy
ER  -