Ecological investigation report
Subtitle: Oregon sivlerspot butterfly (Speyeria zerene hippolyta) : Mt. Hebo supplement
By: by Paul C. Hammond with the assistance of David V. McCorkle and Glory Penington.
Contributors: McCorkle, David V. 1934-; Penington, Glory.
Publisher: Forest Service USDA, Pacific Northwest Region, Siuslaw National Forest
Published: 1980
Place of publication: [Portland? Or.]
Language: eng
Number of pages: 43
Subjects: Silverspot.; Butterflies -- Oregon -- Hebo, Mount.
Other titles: Oregon silverspot butterfly (Speyeria zerene hippolyta).; Hebo supplement.
Notes: On cover: Hebo supplement.

Two maps in pocket.

Includes index.

Bibliography: leaf 41.