How much retrospective coverage does PsycEXTRA have?
Many of the document types covered in PsycEXTRA such as conference papers, technical reports, brochures, and facts sheets are one-time publications. No retrospective coverage can be provided for these, although original documents are retained in the database along with any updated or revised editions. There is a growing body of historical material in PsycEXTRA, including all issues of the APA Monitor to volume 1. The database also includes many important early studies.
