1. St. Marys River. Amendment 4 to Rules for St. Marys River [Mich., relating to anchorage and navigation, adopted] June 1, 1932; approved Apr. 16, 1935. Bookmark Corporate/Agency Authors: Navigation and Steamboat Inspection Bureau and Commerce Department Publisher: Navigation and Steamboat Inspection Bureau Date: [1935.] SuDoc number: C 11.2:Sa 2/4/amdt.4