We report on measurements of the h_1 structure function, relevant to calculating cross-sections for the Drell-Yan process. This is a quantity can not be measured in deep inelastic scattering, it gives additional information on the spin carried by the valence quarks, as well as insights on how relativistic the quarks are. (orig.)8 refs.Available from TIB Hannover: RA 2999(96-152) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman