Skovlin, Jon M. Interpreting Long-Term Trends in Blue Mountain Ecosystems from Repeat Photography. General Technical Report PNW-GTR-315 / Jon M. Skovlin, Jack Ward Thomas. -- 1.vyd. -- Portland : U.S.Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1995. -- 102 s.: obr.

I. Thomas, Jack Ward
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