Proposed revisions and additions to the Compendium of Copyright Office practices for 1973 are presented. The bulk of the changes occur in Chapter 2, "Copyrightable Matter." The sub-areas, "Periodicals (Class B),""Works Prepared for Oral Delivery (Class C),""Music (Class E)," and "Motion Pictures (Classes L-M)," are replaced with revised pages while the sub-areas, "Works of Art (Class G)" and "Photographs (Class J)" represent new and additional pages to the Compendium. The Preface indicates that the Compendium is primarily an office manual for the use of the staff of the Copyright Office and is not a book of "rules" to be followed. (WH)