TY  - GEN
AU  - C E Waters
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1941-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.CIRC.431
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1941
TI  - Circular of the Bureau of Standards no. 431::typewriter ribbons and carbon paper
ER  -