TY  - RPRT
TI  - Letter Circular 447: publications on paper and paper research by the staff of the National Bureau of Standards
PY  - 1935
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 447
DO  - 10.6028/NBS.LCIRC.447
ER  -