Sources

This study summarizes and amalgamates much information collected, compiled, and utilized by the Bureau of Mines numerous country specialists and branch chiefs for inclusion in their country and regional reports that comprise the five other volumes of the international studies of the Minerals Yearbook. Because of the plethora of sources used in preparing these regional studies, it is impossible to cite all sources of information used in preparing this summary, but some recognition seems due. Generally speaking, the preparation of this study, and its related detailed studies on countries and areas, would be impossible without the efforts of the personnel of our counterpart agencies throughout the world. Information that they collect, compile, and then publish, either in their own volumes or in publications of central statistical agencies in their countries, are the foundations upon which this work rests. Thus, we must begin by expressing our appreciation to the multitude of persons employed by these agencies for their contributions.