From Abstract: "Optical Properties of U.S. coals of differing rank have been investigated by the Bureau of Mines for about 20 years. These investigations have been made to further the development of an objective basis for petrographic analysis of coal and to add knowledge of the structure and composition of coal and coal components by determining their optical constants in various regions of electromagnetic spectrum."

From Introduction: "This publication includes the laws of the States, the District of Columbia, Puerto Rico, and the Virgin Island through 1964. Only those portions of the workmen's compensation laws which apply to or are related to and deletions from the basic law have been incorporated into the text of the law, thus making it unnecessary to search out the various amendments made each year."

From Abstract: "In addition to elementary statistical theory the material presented in the bulletin includes: (1) Certain special statistical techniques that have been found useful in mining applications; (2) problems, implications, and limitations that may be encountered in applying these techniques in mine sampling and evaluation; and (3) numerous examples to demonstrate application of the theory and techniques." From Introduction: "This report presents some of the statistical techniques that are useful for evaluating a mineral deposit and makes it possible for the analyst to derive much additional information from a set of assay data."