
Use inside facilities to mark access routes to shelter areas and the shelter area itself." The same document describes the sign shown below as follows: "Interior sign, Type II, size 10" x 14", galvanized steel, 0.018" thick, with partially reflectorized surface and overlays.

Used to mark facility entrances." The interior signs were made of steel.

The "Posting Fallout Shelter Signs Handbook" FG-C-8.1 (June 1964) describes the sign below right as follows: "Exterior sign, Type I, size 14" x 20", aluminum, 0.025" thick with partially reflectorized surface and overlays.
