BIBLIOGRAPHY AND INDEX OF NORTH AMERICAN 
GEOLOGY, PALEONTOLOGY, PETROLOGY, AND 
MINERALOGY FOR THE YEAR 1901. 
By Fred Boughton Weeks. 
INTRODUCTION. 
The preparation and arrangement of the material of the Bibliog- 
raphy and Index for 1901 is similar to that adopted for the previous 
publications (Bulletins Nos. 130, 135, 146, 149, 150, L62, 172, 188, 
and 189). Several papers that should have been entered in the pre- 
vious bulletins are here recorded, and the date of publication is given 
with each entry. 
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. 
