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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
 
Panama Canal, 1904. Creator: Harris & Ewing
 
Photographer with Large Format Camera, 1914. Creator: Harris & Ewing
 
Bureau of Reclamation - Arrowcock [sic] Dam, Boise, Idaho; Showing Tunnel..., 1912. Creator: Harris & Ewing
 
Reclamation, Bureau Of - Big Men in U.S. Reclamation Service: A.P. Davis, Chief Engineer..., 1912. Creator: Harris & Ewing
 
Bureau of Reclamation - Shoshone Dam, Wyoming, Highest in World, 1912. Creator: Harris & Ewing
 
Bureau of Reclamation - Truckee-Carson Project, Nevada; Canal Carrying Truckee River To..., 1912. Creator: Harris & Ewing
 
Richardson Tandem Biplane Hydroplane on Potomac, April, 1916. Creator: Harris & Ewing
 
Richardson Tandem Biplane Hydroplane Taking Off On Potomac, April, 1916. Creator: Harris & Ewing
 
Roosevelt Dam, Arizona - Salt River Project of Bureau of Reclamation, Dedication Scene, 1912. Creator: Harris & Ewing
 
Seal of The United States - Stamping Bonds, 1917. Creator: Harris & Ewing
 
Seal of The United States at State Department, 1917. Creator: Harris & Ewing
 
Seal of The United States at State Department, 1917. Creator: Harris & Ewing
 
Seal of The United States at State Department, 1914. Creator: Harris & Ewing
 
Target Practice - Range Finder at Work, 1913. Creator: Unknown
 
Target Practice - Range Finding Device, 1913. Creator: Unknown
 
Target Practice - Torpedo, 1913. Creator: Unknown
 
Target Practice - Torpedoes, 1913. Creator: Unknown