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Glass limit standards deposited at NBS for railway, highway and airways traffic signal colors
| Location | Call # | Status |
|---|---|---|
| Joyner - Fed Docs Stacks | C 13.46:564 | ✔ Available |
United States standard for the colors of signal lights
| Location | Call # | Status |
|---|---|---|
| Joyner - Fed Docs Stacks | C 13.11:95 | ✔ Available |