This application for Wild Plant Sanctuary status for the Robert B. Gordon Natural Area was submitted to the PA Department of Conservation and Natural Resources in 2013 by Gerard Hertel and Harry Tiebout. It includes a plant survey and vegetational history of the preserve.
Hertel, G. (2013). Private Wild Plant Sanctuary Designation Application, Gordon Natural Area. Retrieved from http://digitalcommons.wcupa.edu/gna_bps_series/3