http://www.wordplayhouse.com/2011/03/how-do-you-make-maple-syrup-maple-sugaring-free-printables.html

http://www.bls.gov/ooh/management/farmers-ranchers-and-other-agricultural-managers.htm#tab-2

http://en.wikipedia.org/wiki/Maple

http://en.wikipedia.org/wiki/Sugar_bush