Size of letters required for visibility as a function of viewing distance and observer visual acuity
By: Gerald L. Howett ; sponsored by the Occupational Safety and Health Administration, U.S. Department of Labor.
Contributors: United States. Occupational Safety and Health Administration.; United States. National Bureau of Standards.
Series: NBS technical note -- 1180.
Publisher: U.S. Dept. of Commerce, National Bureau of Standards; For sale by the Supt. of Docs., U.S. G.P.O.
Published: 1983
Place of publication: Washington, DC
Language: eng
Number of pages: 61
Subjects: Visual acuity.; Lettering.
Notes: "Issued July 1983."

Bibliography: p. 50-51.