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The principal hydrographer of the nineteenth century was Admiral Bayfield, who extended the survey over the Great Lakes, besides re-surveying all the older navigational waters with such perfect skill that wherever nature has not made any change his work stands to-day, reliable as ever.
Although the main features of our maps are still correct, there have been great changes in the river-bed between Porto da Lenha and Boma, especially about the latter place, which should be transferred from its present site to Lumbi. The broad Chisalla Creek, which Mr. In fact all the bank about Boma, like the lower delta, urgently calls for re-surveying.
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