RI 3490 Annual Report Of The Explosives Division, Fiscal Year 1939 ? Introduction (2dcb94ad-dd15-44ff-8b85-29719cc37115)

The work of the Explosives Division, Bureau of Mines, United States Department of the Interior, for the fiscal year ended June 30, 1939, is described in the following pages. This paper is the fourth of a series of annual reports covering the activities of the division since July 1, 1936. The studies outlined in this and preceding reports of the series have been conducted under the direction of the author and the respective unit leaders to whom specific credit is indicated.