Thomas, Elizabeth. "Forest Protection and the Founding of Pennsylvania’s State Forestry School, 1901-1903" in Pennsylvania History., 291-315.October 1977.
Referenced in:
George Herman Wirt
Thomas, Elizabeth. "Forest Protection and the Founding of Pennsylvania’s State Forestry School, 1901-1903" in Pennsylvania History., 291-315.October 1977.
Referenced in:
George Herman Wirt