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Ambrotype of a group of men posing on a wagon probably in California, 1862. The man holding the reins is identified as Josiah Wright and the trailer behind him is his traveling photography studio.
Source.

Ambrotype of a group of men posing on a wagon probably in California, 1862. The man holding the reins is identified as Josiah Wright and the trailer behind him is his traveling photography studio.

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Daguerreotype portrait of an unidentified member of the Calwater Grays, a Pennsylvania militia unit, c. 1852. By Charles Evans.
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Daguerreotype portrait of an unidentified member of the Calwater Grays, a Pennsylvania militia unit, c. 1852. By Charles Evans.

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Color autochrome photograph of French soldiers in a trench manning a St. Étienne Mle 1907 machine gun during World War 1.

Color autochrome photograph of French soldiers in a trench manning a St. Étienne Mle 1907 machine gun during World War 1.

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A reviewing stand seating a crowd of spectators located next to the Treasury Building during the Grand Review of the Armies, Washington, D.C., May 1865. Attributed to Mathew Brady. Animated stereoscopic photographs.
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A reviewing stand seating a crowd of spectators located next to the Treasury Building during the Grand Review of the Armies, Washington, D.C., May 1865. Attributed to Mathew Brady. Animated stereoscopic photographs.

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Daguerreotype portrait of a girl sitting at a table with an open book, c. 1840’s.

Daguerreotype portrait of a girl sitting at a table with an open book, c. 1840’s.

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A Union soldier and a group of civilians (at least two of whom are wearing badges) posing in front of a house damaged by artillery fire during the Battle of Fort Stevens, Washington, D.C., 1864. Animated stereoscopic photographs.
Source.

A Union soldier and a group of civilians (at least two of whom are wearing badges) posing in front of a house damaged by artillery fire during the Battle of Fort Stevens, Washington, D.C., 1864. Animated stereoscopic photographs.

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Daguerreotype self-portrait of Isaac Wallace Baker standing at the entrance of Batchelder’s Daguerrian Saloon, a mobile photography studio set up for business somewhere in California, c. 1851.
Source.
More information 1.
More information 2.

Daguerreotype self-portrait of Isaac Wallace Baker standing at the entrance of Batchelder’s Daguerrian Saloon, a mobile photography studio set up for business somewhere in California, c. 1851.

Source.

More information 1.

More information 2.

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Union soldiers of the 127th Ohio Volunteer Infantry Regiment posing on Sandusky Street in Delaware, Ohio, c. 1863. The unit was later renamed the 5th United States Colored Infantry Regiment.
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Union soldiers of the 127th Ohio Volunteer Infantry Regiment posing on Sandusky Street in Delaware, Ohio, c. 1863. The unit was later renamed the 5th United States Colored Infantry Regiment.

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Ernest Hemingway posing with three nurses including the woman he almost married, Agnes von Kurowsky (center left), at San Siro Racecourse in Milan while recovering from wounds he received while serving as an ambulance driver on the Italian Front, 1918.
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Ernest Hemingway posing with three nurses including the woman he almost married, Agnes von Kurowsky (center left), at San Siro Racecourse in Milan while recovering from wounds he received while serving as an ambulance driver on the Italian Front, 1918.

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Daguerreotype portrait of brevet 2nd lieutenant George B. McClellan in uniform posing with his father and one of his brothers shortly before heading off to fight in the Mexican-American War, 1846.
Source.
More information.

Daguerreotype portrait of brevet 2nd lieutenant George B. McClellan in uniform posing with his father and one of his brothers shortly before heading off to fight in the Mexican-American War, 1846.

Source.

More information.