McGill Ranch tree #4. Forked at 6'; 27.8" diameter outside bark and 22.4" diameter inside bark. Stripped to a height of 12 ft. Yielded over 300 lbs. cork. 1940

Chicago citation style
Metcalf, Woodbridge. McGill Ranch tree #4. Forked at 6'; 27.8" diameter outside bark and 22.4" diameter inside bark. Stripped to a height of 12 ft. Yielded over 300 lbs. cork. 1940. 1940. Retrieved from the Digital Public Library of America, http://dc.lib.berkeley.edu/catalog/Metcalf_metcalf1_7173. (Accessed December 16, 2018.)
APA citation style
Metcalf, Woodbridge, (1940) McGill Ranch tree #4. Forked at 6'; 27.8" diameter outside bark and 22.4" diameter inside bark. Stripped to a height of 12 ft. Yielded over 300 lbs. cork. 1940. Retrieved from the Digital Public Library of America, http://dc.lib.berkeley.edu/catalog/Metcalf_metcalf1_7173
MLA citation style
Metcalf, Woodbridge. Retrieved from the Digital Public Library of America <http://dc.lib.berkeley.edu/catalog/Metcalf_metcalf1_7173>.
Note: These citations are programmatically generated and may be incomplete.