U. S. DEPARTMENT OF COMMERCE 
Daniel C. Roper, Secretary 
BUREAU OF FISHERIES 
Frank T. Bell, Commissioner 
THE GEOGRAPHIC DISTRIBUTION 
AND ENVIRONMENTAL LIMITATIONS OF THE 
PACIFIC SALMON (GENUS ONCORHYNCHUS) 
By FREDERICK A. DAVIDSON and SAMUEL J. HUTCHINSON 
From BULLETIN OF THE BUREAU OF FISHERIES 
Volume XLVIII 
Bulletin No. 26 
UNITED STATES 
GOVERNMENT PRINTING OFFICE 
WASHINGTON : 1938 
For sale by the Superintendent of Documents, Washington, D, C. 
Price 10 cents 
