{"value"=>"<p>Consist of eleven volumes of letter books beginning with his work for the Edison Company and ending with the absorption of the Sprague Electric Company by General Electric in 1902. (The years 1886, 1887, and 1890 are not covered). Two of the letter books of the Sprague Electric Railway and Motor Company were kept by F. H. Parshall, who, like Sprague, worked for both the Edison Company and Sprague.</p>"}