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This bibliography, an update of a previous document cited under ED 071 148, includes mainly references to materials published or research reports made available during the period 1970-1972. References to Canadian materials that were cited in the former publication are included, as well as some few references to works by authorities whose names recur repeatedly throughout research reports.. Included are books, journal articles, research reports, dissertations, and audiovisual items from Canadian and American sources. Annotations provide a very brief indication of content without attempting critical evaluation.. The bibliography has been divided into general material on nongrading, followed by specific applications to elementary, intermediate, and secondary schools..A separate section includes related research reports, followed by references to literature relating to instruments for placement an