LETTER OF TRANSMITTAL. 
Department of the Interior, 
United States Geological Survey, 
Washington, I). G, June 13, 1903. 
Sir: I have the honor to submit herewith a report entitled "The 
Coal Resources of the Yukon," by Mr. Arthur J. Collier, and to recom- 
mend its publication as a bulletin. This report deals entirely with 
the economic results of Mr. Collier's investigations during the last 
field season. His studies of the Yukon section developed some very 
important stratigraphic results regarding the Mesozoic and Tertiary 
succession, but the limited time made it impossible for him to solve 
the many interesting problems that arose in the course of the work. 
It has therefore seemed best to include in this report only the barest 
outline sketch of the geology, the more complete discussion of the 
stratigraphy being deferred until the results of further studies, already 
begun, shall be available. 
Veiy respectfully, 
Alfred II. Brooks, 
Geologist in Charge of Geologic Work in Alaska. 
Hon. Charles D. Walcott, 
Director United States Geological Survey. 
