@mastersthesis {27558,
	title = {Effect of stand diameter on cost of skidding tree length wood with rubber tired skidders},
	volume = {Forestry},
	year = {1967},
	pages = {53},
	address = {University of Michigan},
	keywords = {logging},
	url = {http://hdl.handle.net/2027.42/115011},
	author = {Hannula, Oliver Millo}
}
