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Culebra Cut, Culebra - Gang of 150 Men Shifting Track By Hand, January 1912. Creator: Harris & Ewing
 
Curtiss Airplane - Curtiss Hydroaeroplane, or Flying Boat Exhibited at House Office Building, 1917. Creator: Harris & Ewing
 
Curtiss Airplane - Type R. Plane, 1916. Creator: Harris & Ewing
 
Langley Medal presented to aviator Glenn Hammond Curtiss, 1913. Creator: Harris & Ewing
 
District of Columbia - Fire Alarm Box And Policeman, 1913. Creator: Harris & Ewing
 
Sue Dorsey, 1918. Creator: Harris & Ewing
 
Sue Dorsey, 1918. Creator: Harris & Ewing
 
William Cushing Edes, Civil Engineer; Chairman, Alaskan Engineering Commission, 1914. Creator: Harris & Ewing
 
Federal Taxicab Garage, 1914. Creator: Harris & Ewing
 
Ernest George Fischer, Chief of Instrument Division, Coastal Geodetic Survey, 1914. Creator: Harris & Ewing
 
Ford Tractor, 1917. Creator: Harris & Ewing
 
Ford Tractor, 1917. Creator: Harris & Ewing
 
Fort McHenry, 1914. Creator: Harris & Ewing
 
Fort McHenry, Cement Gun Used in Building Camp, 1917. Creator: Harris & Ewing
 
Fort McHenry, Cement Gun Used in Building Camp, 1917. Creator: Harris & Ewing
 
Miss Elizabeth Funk, 1917. Creator: Harris & Ewing
 
General view from temporary tower on north end of approach wall looking south..., July 18, 1913. Creator: Harris & Ewing
 
T.K. Giragossian, 1917. Creator: Harris & Ewing
 
Gunnison River Project...Canal Under 2000 Feet Water To Uncomphagre [sic] Valley..., 1912. Creator: Harris & Ewing
 
Hargrave Box Kite, Airplane Target at Fortress Monroe; Modified Hargrave Box Kite, Incorp..., 1917. Creator: Harris & Ewing
 
House Office Building - Telephone Exchange, 1912. Creator: Harris & Ewing
 
Hydraulic Excavation, Miraflores - Monitors in Oberation [sic], December 21, 1910. Creator: Harris & Ewing
 
Dr. Howard A. Kelly, Radium Expert of Baltimore, 1914. Creator: Harris & Ewing
 
Langley Field, Va. - Curtis Jn4D Plane, with Olmstead Propeller And Ackerman Wheels, 1917. Creator: Harris & Ewing
 
Experimental Tandem Biplane On Potomac Embodying Langley Principles, 1917. Creator: Harris & Ewing
 
Experimental Tandem Biplane On Potomac Embodying Langley Principles, 1917. Creator: Harris & Ewing
 
Experimental Tandem Biplane On Potomac Embodying Langley Principles, 1917. Creator: Harris & Ewing
 
Life Saving Suit Worn By T. Aud, 1916. Creator: Harris & Ewing
 
Machine Gun Board of War Department - Tracy Dixon, Brig. Gen. Todd, Newton D. Baker..., 1917. Creator: Harris & Ewing
 
Leonard D. Mahon with steel helmet he invented that could be used as shovel, 1917. Creator: Harris & Ewing
 
Leonard D.Mahon with Steel Helmet He Invented That Could Be Used As Shovel, 1917. Creator: Harris & Ewing
 
Marine Corps Rifle Range, Lewis Machine Gun Tests, 1917. Creator: Harris & Ewing
 
Marine Corps Rifle Range, Winthrop, Md. - Gen. Barnett Testing Colt's Automatic Machine Gun, 1917. Creator: Harris & Ewing
 
Marine Corps Rifle Range, Winthrop, Md. - Gen. Barnett Testing Colt's Automatic Machine Gun, 1917. Creator: Harris & Ewing
 
Marine Corps Rifle Range, Winthrop, Md. - Gen. Barnett Testing Colt's Automatic Machine Gun, 1917. Creator: Harris & Ewing
 
Charles Frederick Marvin, Chief, Weather Bureau, 1913. Creator: Harris & Ewing
 
Charles Frederick Marvin, Chief, Weather Bureau, 1913. Creator: Harris & Ewing
 
Charles Frederick Marvin, Chief, Weather Bureau, 1913. Creator: Harris & Ewing
 
Charles Frederick Marvin, Chief, Weather Bureau, 1913. Creator: Harris & Ewing
 
Mergenthaler, Ottmar, 2nd Linotype Machine with Band, Invented By Him; 3rd Design He..., 1917. Creator: Harris & Ewing
 
Mountaineers - Mountain Women, 1913. Creator: Harris & Ewing
 
Mountaineers - Mountain Women, 1913. Creator: Harris & Ewing
 
Curtiss Biplane 2 Engines, with Floats..., 1917. Creator: Harris & Ewing
 
Curtiss Biplane 2 Engines, with Floats..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Biplane 2 Engines, with Floats, Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Aero Coast Patrol Commn. - Curtiss Hydroaeroplane or Flying Boat Exhibited..., 1917. Creator: Harris & Ewing
 
National Geographical [sic] Society - Anniversary of Bell Telephone, 1916. Creator: Harris & Ewing
 
National Guard of D.C. - Field Tactics, 1915. Creator: Harris & Ewing
 
Panama Canal, 1913. Creator: Harris & Ewing
 
Panama Canal, 1913. Creator: Harris & Ewing
 
Panama Canal, 1913. Creator: Harris & Ewing
 
Panama Canal, 1913. Creator: Harris & Ewing