Middle River and Dark Head Creek, Back River to Chesapeake Bay via Hart Island Narrows, and cut-off channel from Gunpowder River to Chesapeake Bay via Spry Island Narrows, Md., letter submitting report on preliminary examination and survey of Middle River and Dark Head Creek, Back River to Chesapeake Bay via Hart Island Narrows, and cut-off channel from Gunpowder River to Chesapeake Bay via Spry Island Narrows, Md.

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