The great lakes and St. Lawrence Seaway winter navigation board 

 - Washington, D.C. :  United States Government Printing Office ,  1979 
 - 136 p. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemical oceanography
<br/><br/><label>Dewey Class. No.: </label>551.4601