BIBLIOGRAPHY AND INDEX OF NORTH AMERICAN 
GEOLOGY, PALEONTOLOGY, PETROLOGY, AND 
MINERALOGY FOR THE YEAR 1904. 
By Fred Boughton Weeks. 
INTRODUCTION. 
The arrangement of the material of the Bibliography and Index for 
1903 is similar to that adopted for the preceding annual bibliographies, 
Bulletins Nos. 130, 135, 146, 149, 156, 162, 172 (combined in Bulletins 
188 and 189), 203, 221, and 240. 
Bibliography. — The bibliography consists of full titles of separate 
papers, arranged alphabetically by authors' names, an abbreviated 
reference to the publication in which the paper is printed, and a brief 
description of the contents, each paper being numbered for index 
reference. 
Index. — The subject headings, their subdivisions and arrangement, 
are shown in the classified key to the index, which immediately pre- 
cedes the index. Reference is made in each entry by author's name 
and number of article in the bibliography. 
The series of annual bibliographies has been prepared solely from 
publications received by the library of the United States Geological 
Survey. On January 1, 1903, the writer was placed in charge of the 
library of this organization, and an effort has since been made to pro- 
cure the publications which were not noticed in the bibliographies of 
previous years, it being known that there were a considerable number 
of omissions of geological papers. Many of these are noted in this 
bulletin. 
Mr. John M. Nickles has again assisted in the compilation of this 
work, and credit is due him for its careful preparation and completeness. 
