Forty-nine maps showing 30-min 1-,2-,3-,6-,12-, and 24-hr point precipitations for return periods of 1, 2, 5, 10, 25, 50, and 100 yr and interpolation diagrams for obtaining values for intermediate durations and return periods are presented. Ratios for obtaining 5-, 10-, and 15-min precipitation from 30-min values are also presented. Area reduction curves for reducing point values for areas up to 400 sq. mi. are included.