Restricted for 15 years; until Jan-01-2024. Copyrighted material in Box 1 (Photograph of Buytl Rubber Manufacture Exhibition, Museum of History and Technology) and Box 2 (Hall of Coal: Scripts, circa 1960); see finding aid. Transferring office; 2/1/2011 memorandum, Johnstone to Jones; Contact reference staff for details
Restricted for 15 years; until Jan-01-2021. Copyrighted material in Box 3 (Mineral Technology: Myles Salt Company, 1916; and John N. Hoffman: "Study of Surface Mine Refuse Fires," Pennsylvania State College, 1949-1950); see finding aid. Transferring office; 5/8/1997 memorandum, Johnstone to Langley; Contact reference staff for details