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This is the third edition of the Index of Crystallographic Supplies prepared on behalf of the International Union of Crystallography by its Commission on Crystallographic Apparatus. The first was compiled by Professor A. Guinier in 1956 and the second under the editorship of Dr. A. J. Rose in 1959. At that time, it was intended that publication of revised editions of the Index should be a continuing project of succeeding Commissions. However, with changing membership and other pressing activities, the preparation of the third edition has been dependent on the acquisition of a Commission member with appropriate experience and enthusiasm. The Commission is therefore fortunate that Professor R. Rudman, who has had considerable experience in the collation of information on crystallographic matters, has undertaken this task. He has been assisted by the advice of the members of the 1969-72 Commission, in particular that of a group which, during a meeting in Marseille, France, July 4-6, 1971 to discuss Commission affairs, went over the draft of the Index in close detail. These included S. C. Abrahams, U. W. Arndt and D. M. Kheiker. The information included in the Index was gathered from replies to a questionnaire which was sent to a wide range of manufacturers and suppliers throughout the world. It is not intended as complete and exhaustive but it should provide a convenient starting point for the location of the appropriate sources of equipment and materials of use to crystallographers.
The National Bureau of Standards Boulder Laboratories at Boulder, Colorado once again served as the host for the 1972 Cryogenic Engineering Conference. For the Cryogenic Engineering Conference it was like coming horne, for it was at the NBS Boulder Laboratories that the Cryogenic Engineering Conference was first conceived and held m 1954m connection with the dedication ofthe NBS Boulder Laboratories by President Dwight D. Eisenhower. The Cryogenic Engineering Conference IS grateful for the continuing support that the National Bureau of Standards has gIVen over the years, and which was expanded on July 1, 1971 when the NBS Boulder Laboratories assumed the secretariat function of the Conference from the National Academy of Sciences. Because of common interests in heat transfer, the 1972 Cryogemc Engineering Conference worked with the 13th National Heat Transfer Conference to develop a joint program m heat transfer. A majority ofthe papers presented in this cooperative effort are incIuded m V olume 18 of the Advances zn Cryogenic Engineerzng through the kmd permission ofthe 13th NatIOnal Heat Transfer Conference and are acknowl edged accordingly.