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Expanded view of Topographic Survey T-331 of "Galveston Bay"

Expanded view of Topographic Survey T-331 of

Original topographic survey T-941 of "City of San Francisco and its Vi...

Original topographic survey T-941 of

Chart of "The Farallones and Entrance to the Bay of San Francisco" by...

Chart of

Embracing surveys of the "Farallones Entrance to the Bay of San Franci...

Embracing surveys of the

Sketch F No.3 of "Proposed Base at Cape Sable, Florida."

Sketch F No.3 of

Sketch F No.4 of "Proposed Base at Cape Florida".

Sketch F No.4 of

Section of the Preliminary survey H-590 of "The Approaches to D'Wamish...

Section of the Preliminary survey H-590 of

Preliminary survey H-590 of "The Approaches to D'Wamish Bay, Washingto...

Preliminary survey H-590 of

Hydrographic survey H-240

Hydrographic survey H-240 Photo

Title block to "the North Side of Charleston Harbor."

Title block to

Copy of sketch map by Captain J

Copy of sketch map by Captain J Photo

Sheet no Photo

Sheet No Photo

SE sheet of six sheets of New York Bay and Harbor

SE sheet of six sheets of New York Bay and Harbor Photo

Portion of Chart of Sandy Hook Bar showing bottom configuration betwee...

Portion of Chart of Sandy Hook Bar showing bottom configuration between Sandy Hook and Long Island. Photo

Portion of Chart of Sandy Hook Bar showing New York Bay to west of San...

Portion of Chart of Sandy Hook Bar showing New York Bay to west of Sandy Hook. Photo

Tide diagram of Chart of Sandy Hook Bar, sounded by Lieutenant T

Tide diagram of Chart of Sandy Hook Bar, sounded by Lieutenant T Photo

Blowup of title block of Hydrographic Sheet No

Blowup of title block of Hydrographic Sheet No Photo

Center portion of Hydrographic Sheet No

Center portion of Hydrographic Sheet No Photo

Topographic shoreline manuscript showing section of Hudson River in th...

Topographic shoreline manuscript showing section of Hudson River in the vicinity of today's Tappan Zee Bridge Photo

Computation book page showing method of determining final value of obs...

Computation book page showing method of determining final value of observed angle. Photo

Title page to computations of triangles observed by Ferdinand Hassler...

Title page to computations of triangles observed by Ferdinand Hassler around New York City in 1817. Photo

Loaf Hill signal as seen from Bald Hill.

Loaf Hill signal as seen from Bald Hill. Photo

Friars Head signal as seen from Mt.Carmel.

Friars Head signal as seen from Mt.Carmel. Photo

Ruland Hill Signal as seen from Mt

Ruland Hill Signal as seen from Mt Photo

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