TY  - GEN
AU  - Gerald L Howett
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1983-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.TN.1180
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1983
TI  - Size of letters required for visibility as a function of viewing distance and observer visual acuity:
ER  -