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The subject matter usually consisted of staged shots well behind the lines, if in fact they were related to the conflict at all.

The technical quality was poor, with dark, muddy images being common.

Keystone assigned a unique 5-digit number to each image; a "V" prefix identified images purchased from Underwood & Underwood.

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The prints with their characteristic arch shape were glued to mounts, then electrotype captions and descriptions were added.

The front markings on each card included the Keystone logo, the principal cities where the company had offices, the image number, and the title.

A 100-card set was probably produced, but it has not yet been reconstructed.

The Title List gives the reconstructed 30- and 48-view versions of the set, as well as the titles of cards likely to have been in the full set. declaration of war on Germany in April 1917, Keystone added about 30 new images showing Fort Sheridan, Illinois, one of the Reserve Officers Training Camps established in May 1917 to train a cadre for the National Army.

Underwood & Underwood sold most of its stereoscopic library to Keystone.

This purchase gave Keystone an archive of nearly one million views and made it "the unchallenged leader in the stereoscopic educational business." In 1932, Keystone began promoting the value of stereographs as therapy in correcting visual problems and established the Stereophthalmic Department to manage that business area.

Throughout the period World War sets were on sale, Keystone creatively retitled and altered file photos to make them appear relevant to that conflict.

The Great War Through Keystone Stereographs, available from 1915.

Production capability varied depending upon the negative, weather, and season.

Some negatives were "slow printers." On a dark day, production might be limited to only one or two prints from each negative, but on a bright day Keystone could make at least 10-12 prints from each negative.

Keystone scraped together 30 file images with geographic relevance to the theaters of military operations, rewrote key parts of the text, and rushed them to their salesmen. This set supplemented the old file photos with about 100 images purchased from European manufacturers.

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