MARYLAND GEOLOGICAL SURVEY 137

	Register No. 778	Locality. Chesapeake Bay, Potomac	Scale.	Topographer.	Date.
		River, Cobb Point to
		Mathias Point............	1-20000	T. S. Phelps, U. S. N.,	1862
	738	Chesapeake Bay, Potomac
		River, Lower Cedar Point
		and Mathias Point........	1-10000	W. R, Palmer, U. S. A.,	1861
	813	Chesapeake Bay, Potomac
		River, Mathias Point to
		Matomkin Point and Port
		Tobacco River............	1-20000	E. S. Phelps, U. S. N.,	1862
	812	Chesapeake Bay, Potomac
		River, Matomkin Point to
		Shipping Point............	1-20000	E. S. Phelps, U. S. N.,	1862
	814	Chesapeake Bay, Potomac
		River, Shipping Point to
		Hallowing Point........	1-20000	E. S. Phelps, U. S. N.,	1862-3
	815	Chesapeake Bay, Potomac
		River, Hallowing Point to
		Fort Washington........	1-20000	E. S. Phelps, U. S. N.,	1863
	816	Chesapeake Bay, Potomac
		River, Fort Washington to
		Alexandria..............	1-10000	E. S. Phelps, U. S. N.,	1863
	766	Chesapeake Bay, Potomac
		River, Alexandria to Hunter
		Point....................	1-10000	C. P. Patterson,	1862
	864	Chesapeake Bay, Potomac
		River, Anacostia River,
		Bennings Bridge, to Blad-
		ensburg................	1-5000	A. Balbach,	1865
	1367a	Chesapeake Bay and estu-
		aries, densities of waters..	1-80000	F. Collins, U. S. N.,	1877
	1367b	Chesapeake Bay and estu-
		aries, densities of waters..	1-80000	F. Collins, U. S. N.,	1877
	1367c	Chesapeake Bay and estu-
		aries, densities of waters..	1-80000	F. Collins, U. S. N.,	1877
	1319	Boundary line between Mary-
		land and Virginia (not a hydrographic sheet)......	1-80000	W. J. Twining and U. S. Engineers	1877