@article {46720,
	title = {Vanderwell Contractors (1971) Ltd. 2004 Detailed Forest Management Plan. Chapter 5. Landscape disturbance. Forest productivity classes},
	year = {2005},
	pages = {3},
	institution = {Vanderwell Contractors (1971) Ltd. },
	url = {http://srd.alberta.ca/forests/pdf/vanderwell/Vanderwell_Chapter_5b.pdf}
}
