A section of one of the 16-ft. fire lines on Fyfe Lake State Forest, Michigan, through a good stand of natural jack pine reproduction. These lines will eventually surround each 40 acres and there are now 110 miles of them on the 7000-acre Fyfe Lake Forest. They cost $150.00 per mile to build and about $4.00 per mile per year to keep up. Usually two cultivations per year are given with tractor or horses

Chicago citation style
Unknown. A section of one of the 16-ft. fire lines on Fyfe Lake State Forest, Michigan, through a good stand of natural jack pine reproduction. These lines will eventually surround each 40 acres and there are now 110 miles of them on the 7000-acre Fyfe Lake Forest. They cost $150.00 per mile to build and about $4.00 per mile per year to keep up. Usually two cultivations per year are given with tractor or horses. Retrieved from the Digital Public Library of America, http://dc.lib.berkeley.edu/catalog/Metcalf_metcalf1_7938. (Accessed December 19, 2018.)
APA citation style
Unknown, A section of one of the 16-ft. fire lines on Fyfe Lake State Forest, Michigan, through a good stand of natural jack pine reproduction. These lines will eventually surround each 40 acres and there are now 110 miles of them on the 7000-acre Fyfe Lake Forest. They cost $150.00 per mile to build and about $4.00 per mile per year to keep up. Usually two cultivations per year are given with tractor or horses. Retrieved from the Digital Public Library of America, http://dc.lib.berkeley.edu/catalog/Metcalf_metcalf1_7938
MLA citation style
Unknown. Retrieved from the Digital Public Library of America <http://dc.lib.berkeley.edu/catalog/Metcalf_metcalf1_7938>.
Note: These citations are programmatically generated and may be incomplete.