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The number of papers reported in the bibliography is approximately 10 per cent below that of last year. In previous years, the bibliography had been growing at the rate of approximately 10 per cent per year so this decrease would indicate that the engineering and research activity in this field is leveling off. The list of 182 abstracts in this supplement, however, still represents a considerable amount of effort. There is certainly no sign that all of the problems have been solved and this general level of activity is expected to continue. There are a few additional errata, which have been called to our attention, and which are listed in the following pages. The Subject Index lists the same headings as were given in the 1957 edition. Part of the Introduction of this edition is repeated here for reference.
Shobert, Erle I.
Manager of ResearchChairman of ASTM Committee B-4, Stackpole Carbon Co., St. Mary's, Pa.