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- Survey of Lake Superior. Sheet 1 [1823-25]Survey of Lake Superior by Lieut Henry W'y Bayfield, R. N. assisted by Mr. Philip Ed. Collins, Mid. between the Years 1823 & 1825 NB The soundings are in Feet Sheet 1 --inset-- Track Survey of the River St. Louis by Mr. Philip Ed. Collins, Mid. under the direction of …Survey of Lake Superior by Lieut Henry W'y Bayfield, R. N. assisted by Mr. Philip Ed. Collins, Mid. between the Years 1823 & 1825 NB The soundings are in Feet …Maritime History of the Great Lakes
- Survey of Lake Superior. Sheet 1 [1823-25, 1863]Survey of Lake Superior by Lieut Henry W'y Bayfield, R. N. assisted by Mr. Philip Ed. Collins, Mid. between the Years 1823 & 1825 NB The soundings are in Feet Sheet 1 Variation in 1860, decreasing about 4' annually --inset-- Track Survey of the River St. Louis by Mr. Philip …Survey of Lake Superior by Lieut Henry W'y Bayfield, R. N. assisted by Mr. Philip Ed. Collins, Mid. between the Years 1823 & 1825 NB The soundings are in Feet …Maritime History of the Great Lakes
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