U. S. DEPARTMENT OF COMMERCE 
Daniel C. Roper, Secretary 
BUREAU OF FISHERIES 
Frank T. Bell, Commissioner 
EFFECTS OF CRUDE OIL POLLUTION ON 
OYSTERS IN LOUISIANA WATERS 
By Paul S. Galtsoff, Herbert F. Prytherch 
Robert 0. Smith, and Vera Koehring 
From BULLETIN OF THE BUREAU OF FISHERIES 
Volume XLVIII 
Bulletin No. 18 
UNITED STATES 
GOVERNMENT PRINTING OFFICE 
WASHINGTON : 1935 
For sale by the Superintendent of Documents, Washington, D. C. 
Price 20 cents 
