This technical report describes a proposed subject retrieval function for the OCLC Online Union Catalog and examines the inadequacies of Library of Congress Subject Headings (LCSH) for the provision of subject access. The function described uses a non-Boolean search approach over data elements present in the MARC record format. Centered around the creation of additional subject index keys and cross-references by LCSH phrase manipulation and title phrase extraction, it would employ familiar OCLC derived key conventions and simulate a Boolean search capability by building precoodinated term combinations into derived index keys. The proposed approach would offer greatly improved subject access over the traditional card catalog by increasing the average number of subject access points per title from 1.4 to more than 22. Four illustrations and 12 references are included. (Author/RAA)