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Almost perfect operation of Skylab Experiment S082A resulted in the return of 1032 extreme ultraviolet solar spectroheliograms, providing an enormous wealth of new information about the sun in the wavelength range 171 to 630. The present User's Guide was written for guest investigators and other ATM experimenters who will collaborate in interpreting the returned data. The first section is devoted to a brief overview of the Apollo Telescope Mount (ATM) as a whole and the major areas in which the data have been found to be most important. There follows a detailed description of the spectroheliograph and the special Schumann film it utilized. The complementary relationshop to the 5 other major instruments on ATM is explained. A large portion of the Guide is devoted to a description of the observations, the data catalogs and documentation, and listings of important events recorded during almost 9 months of nearly continuous operation of Skylab, beginning in May 1973. The main part of the Guide describes filmed copies of the data available from the National Space Science Data Center (NSSDC), Greenbelt, Maryland. A thorough discussion of how to extract data from the photographic images includes a special section on the derivation of relative intensity values. The Appendix contains an extensive bibliography of papers on the ATM results published by the Naval Research Laboratory data analysis team. A spectroheliogram overlay scaled to the NSSDC film identifies prominent spectral features. (Author)