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ANALYTICAL CHEMISTRY
erage of thermophysical properties information. Volume I I of the Retrieval, which was published early in 1963, brought the total coverage of this work to 20,000 research papers covering the world literature contributed by approximately 19,940 authors published in over 2420 journals. Nearly 30,000 substances were reported in some 81,300 reference entries, covering the initial thirteen of a contemplated forty-seven thermophysical properties. T h e coverage includes the open literature, government reports, academic dissertations, and, to a limited degree, reports of private and industrial organizations. Subsequent volumes of the Retrieval Guide will be published approximately every eighteen months, each volume adding to the previous ones an additional 10,000 or more research papers on thermophysical properties. With the publication of Volume I I I , it is anticipated t h a t nearly all of the world literature of the first seven groups of thirteen properties, covering all matter, will have been reported in highly organized form for all literature back to the year 1920. The properties presently covered and those contemplated beginning with Volume IV, are shown in Table I I I . T P R C also publishes each year "Masters Theses in the P u r e and Applied Sciences," which represents the most complete listing of M a s ters' Theses of over 180 United States colleges and universities. In the area of critical tables of properties T P R C ' s aim is to bring about critical evaluation, analysis, correlation, as well as new calculations of data on a continuing basis. T P R C ' s activities in this area (1) ensure the preservation of the results of basic and applied research, (21 shorten the time for research results in finding their place in design, (3) establish a "feedback" into basic science, and (4) provide the key ingredient in avoiding costly mistakes and duplications in useless hardware development. T P R C is working on three data books. They a r e : D a t a Book, Volume 1: Metallic Elements and their Alloys (gaseous, liquid, and solid states) ; D a t a Book, Volume 2: Nonmetallic Elements and their Com-
