Version 1

(1) The codebook is provided by ICPSR as a Portable Document Format (PDF) file. The PDF file format was developed by Adobe Systems Incorporated and can be accessed using PDF reader software, such as the Adobe Acrobat Reader. Information on how to obtain a copy of the Acrobat Reader is provided on the ICPSR Web site. (2) Documentation is provided from the Bureau of the Census detailing the CENSPAC command language for file definition and report generation, the Census documentor for preparing file documentation, and information on system installation. (3) Version 3.2 of the the Census Software Package consists of programs written in 1974 ANSI COBOL and requires 170k bytes of main memory, direct access storage for dictionary files, and input and output devices. CENSPAC was developed on an IBM 370/168 VS, but is also operational under UNIVAC EXEC-8, IBM OS, IBM DOS, Burroughs 7700 CDC 7000, UNIVAC 90/80, Honeywell 6600, DEC 20, DEC Vax, and APPLE II operating systems.