TY  - GEN
AU  - W R Knight
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1952-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.RPT.1834
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1952
TI  - How many guards?:
ER  -