The Keystone View Company was created in 1892 in Meadville, Pennsylvania by B.L. Singley as a company whose primary focus was to create a large variety of stereocards. By 1905 it was the largest sterographic company in the world. Keystone created and distributed millions of stereocards throughout the United States. In 1898 they organized their highly successful Education Department which produced boxed sets for school instruction of images and descriptive text illustrating culture, industry, commerce and politics world-wide. Stereocards came in different sets marked by a letter. Customers could buy stereocards by the "book", a box shaped like a book which contained 50, 100, or 200 stereocards. This collection prominently features set "P", the educational set designed for elementary school-aged children. While stereocards had been losing popularity shortly after cinema became one of the most popular entertainment mediums, the Keystone Company continued to produce stereocards until 1972 when it went out of business.