Chemical evolution and the origin of life:  cumulative keyword subject index 1970-1986.
This cumulative subject index encompasses the subject indexes of the bibliographies on Chemical Evolution and the Origin of Life that were first published in 1970 and have continued through publication of the 1986 bibliography supplement.  Early bibliographies focused on experimental and theoretical material dealing directly with the concepts of chemical evolution and the origin of life, excluding the broader areas of exobiology, biological evolution, and geochemistry.  In recent years, these broader subject areas have also been incorporated as they appear in literature searches relating to chemical evolution and the origin of life, although direct attempts have not been made to compile all of the citations in these broad areas.  The keyword subject indexes have also undergone an analogous change in scope.  Compilers of earlier bibliographies used the most specific term available in producing the subject index.  Compilers of recent bibliographies have used a number of broad terms relating to the overall subject content of each citation and specific terms where appropriate.  The subject indexes of these 17 bibliographies have, in general, been cumulatively compiled exactly as they originally appeared.  However, some changes have been made in an attempt to correct errors, combine terms, and provide more meaningful terms.
Roy
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Science Communication Studies, George Washington University, Washington, DC 20006.
Powers
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D018559:Exobiology; D000069497:Origin of Life