Yazar
Gerald Leonard Howett
4 cilt bulundu.
Cilt sonuçları
Emergency vehicle warning lights
Gerald Leonard Howett · U.S. Dept. of Commerce, National Bureau of Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off.
165 sayfa · 1978
Emergency vehicles / Lighting
Size of letters required for visibility as a function of viewing distance and observer visual acuity
Gerald Leonard Howett · For sale by the Supt. of Docs., U.S. G.P.O.
61 sayfa · 1983
Lettering / Visual acuity