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Some of the methods herein described have been modified and separate Bureau of Standards publications have been issued or are in preparation on specific classes of the materials included herein. In view of the continued demand for the more general treatment of the subject of miscellaneous materials, and pending the publication of the complete series of bureau circulars on the subjects treated, the text is reproduced without change. Two pages of notes and more obvious corrections are added,doi:10.6028/nbs.mp.15 fatcat:z7ung3z4fbej3hfqopflz73lkm