This paper summarizes the findings of a 1976 national survey on usage of paper-to-paper photocopying machines in the U.S. libraries, which was conducted by King Research, Inc. for the National Commission on Libraries and Information Science, the National Science Foundation, and the National Commission on New Technological Uses of Copyrighted Works (CONTU). The survey sampled 370 public, academic, special, and federal libraries to represent a population of 21,280 libraries. An analysis of interlibrary loan requests from the Minnesota Interlibrary Telecommunications Exchange (MINITEX) was also part of the study. The report presents data on the number and type of photocopy machines in U.S. libraries and the volume of photocopying of library material by type of library; type of transaction, e.g., fulfilling an interlibrary loan request; and type of material copied. Secondly, data on the volume of photocopying of serials in U.S. libraries is provided, broken down by copyright status of serial, type of library, and type of transaction. Eleven graphs and charts illustrate findings of the study. Figures for distribution of photocopying across libraries indicate that a minority of libraries account for a majority of photocopying. The report concludes with discussion of possible copyright royalty payment mechanisms based on the study findings. (Author/ESR)