The solar reference spectrum named R74113 announced at the 1975 International Association of Geomagnetism and Aeronomy symposium in Grenoble refers to the solar conditions of April 23, 1974, and covers the wavelength range 14--2000 ¿. The fluxes for R74113 between 250 and 1940 ¿ were based on a preliminary evaluation of data obtained from a rocket experiment flown on April 23, 1974. The fluxes outside of the wavelength range covered by the rocket experiment were estimated values for the solar condition of April 23, 1974. This reference spectrum has been revised because of refined evaluation of the rocket data and detailed experience gained from many scans of the solar spectrum for the entire wavelength range 140--1850 ¿ obtained from the extreme ultraviolet spectrometer experiment on the AE-E satellite. Although numerous changes have been made in the revised spectrum named F74113, summarized here, these changes have only a small effect on aeronomical calculations that have been based on the original reference spectrum.