TY  - GEN
AU  - Booker, Robert L
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1975-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.IR.75-663
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1975
TI  - Color requirements for the marking of obstructions:
ER  -