TY  - RPRT
TI  - Proceedings of the fourth international congress for stereology 
AU  - Underwood, Erwin E
AU  - De Wit, R
AU  - Moore, George A
PY  - 1976
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 431
DO  - 10.6028/NBS.SP.431
ER  -