This bibliography and the related synthesis of research were assembled to make Head Start studies more accessible to researchers and to inform policymakers and practitioners about the major findings included in this body of research. The bibliography and the literature review constitute an update of the 1975 publication: "A Review of Head Start Research Since 1965 and an Annotated Bibliography." The bibliography includes six sections: (1) an introduction explaining the methodology used to develop the bibliography and discussing the arrangement of the bibliography; (2) the 1,653 item annotated bibliography itself; (3) the co-author index which enables the reader to link various parts of a study which appear as different documents, often produced by different authors; (4) the index of studies which links major studies by their most familiar name with the name of the corporate or organizational author; (5) the explanation of the subject index which defines subject codes and the codes used to identify availability of the documents included in the annotated bibliography; and (6) the subject index which identifies all of the documents in the annotated bibliography by a unique item number and links each document to the major subject codes used to index the literature data base. While preschool advocacy articles, newspaper-type summaries of studies, and training manuals are not included, some studies about preschool programs other than Head Start are included. (RH)