Supplement 4, 1903, corrections and additions to bulletin 13, a, Lake Superior and St. Marys River; b, Lake Michigan and Green Bay: c, Lake Huron, St. Clair River, Lake St. Clair, Detroit River; d, Like Erie and Niagara River to Niagara Falls; e, Niagara River below Niagara Falls, Lake Ontario, St. Lawrence River; to supplement information given upon charts of Great Lakes.

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