Civilian space stations and the U.S. future in space. (OCLC #11477461)
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Government documents are often available in multiple formats (print, electronic, microform). An older cataloging practice was to have a single bibliographic record representing the title in all formats (manifestations), but now we catalog each format on its own bibliographic record. In a FRBR or linked data environment where we are storing statements rather than pre-gathered records, there would be less of a distinction here.