This report is 59th in a series of annual reports on the 

 International Ice Patrol Service in the North Atlantic Ocean. 

 It contains information on Ice Patrol organization, communi- 

 cations and operations, on ice and environmental conditions 

 and their relationship in 1973, and a listing of iceberg 

 casualties to shipping, 1800 - 1973. 



The author of this report. Lieutenant Douglas W. CROWELL, 

 USCG acknowledges ice and weather data provided by the 

 Canadian Department of the Environment, weather data provided 

 by the U.S. National Weather Service, weather and ocean- 

 ographic data provided by the U.S. Naval Weather Service, and 

 oceanographic data provided by the U.S. Coast Guard Ocean- 

 ographic Unit. Acknowledgement is also made to Yeoman First 

 Class Bruce S. COLLINS, USCG, Yeoman Third Class Philip T. 

 KEITH, USCG, Marine Science Technician First Class Neil 0. 

 TIBAYAN, USCG, Marine Science Technician Second Class Raymond 

 J. EVERS, USCG, Marine Science Technician Third Class James M. 

 GAYNOR, USCG, and Marine Science Technician Third Class Larry 

 D. STARK, USCG for their assistance in the preparation of the 

 manuscript and illustrations for this report. 



The continued generosity and cooperation given by the 

 Canadian Forces in permitting the International Ice Patrol to 

 utilize their facilities at Summerside, Prince Edward Island 

 is again gratefully acknowledged. 



