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A field guide to Pacific States wildflowersfield marks of species found in Washington Oregon California and adjacent areas a visual approach arranged by color form and detailBook由 Niehaus, Theodore F.
出版 1976 -
An illustrated flora of the northern United States Canada and the British possessionsfrom Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102d meridianBook由 Britton, Nathaniel Lord, 1859-1934
出版 1913 -
Mountain plants of the Pacific Northwesta field guide to Washington western British Columbia and southeastern AlaskaBook由 Taylor, Ronald J., 1932-
出版 1995 -
A field guide to western reptiles and amphibians;field marks of all species in western North AmericaBook
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Field guide to old-growth forestsexploring ancient forest ecosystems from California to the Pacific NorthwestBook由 Eifert, Larry
出版 2000 -
Watching Washington butterflies;an interpretive guide to the State's 134 species including most of the butterflies of Oregon Idaho and British ColumbiaBook由 Pyle, Robert Michael
出版 1974