Abstract Collection consists of 218 images from the "600 Set" of glass lantern slides produced by the Keystone View Company, a distributor of stereographic images formed in 1892 in Meadville, Pennsylvania, by B. L. Singley. For use in the classroom, each slide is approximately 4 inches by 3.25 inches and labeled with a number and a short description. Images depict a wide range of subject matter but primarily illustrate places of urban and rural commercial and agricultural industry including farms,...