Johnson, John A. Building aerial photo interpretation keys to the NWO FEC S-types and V-types in the Roslyn Lake Study Area : a case study / John A. Johnson, Sheila A. Walsh. -- Sault Ste. Marie : Canadian Forest Service, 1997. -- 39 s. : 9 obr., 5 tab., príl. ; 28 cm. -- (NODA/NFP technical report ; TR-40). -- ISBN 0-662-25124-5 (brož.)

I. Walsh, Sheila A.

528.77/.8+528.77+630*582
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