@article {31158,
	title = {Vegetation types and forest productivity : west part of Syncrude{\textquoteright}s Lease 17, Alberta. Appendix I. Species significance ratings for 27 sample plots in 8 vegetation types, west part of Syncrude Lease 17},
	volume = {Environmental Research Monograph 1977-6},
	year = {1977},
	pages = {36-41},
	institution = {Western Ecological Services Ltd. for Syncrude Canada},
	author = {Peterson, E. B. and Levinsohn, A. G.}
}
