This folder contains documents, primarily correspondence, relating to the daily activities and improvements at the Ogden works. Most of the letters are from Cal Freid and R. H. Cunningham, superintendents, to Edison regarding the progress of work. Some letters concern the market for Edison's crushing technology, including its use at the New Jersey Zinc Co. in Franklin, New Jersey. There is one undated letter in Edison's hand instructing Walter S. Mallory, vice president, to take samples from ore tailings. Some items relate to briquettes, the quality of ore from the Ogden mines, and conditions in the iron market. Some of the material may be partially or completely illegible due to light and faded ink and discolored paper. Approximately 40 percent of the documents have been selected. Courtesy of Thomas Edison National Historical Park.