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verna r johnston
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Sierra Nevada
Verna R. Johnston · University of California Press
241 sayfa · 1970
Natural history / Natural history (Calif. and Nev.) / Natural history, united states / Sierra nevada (calif. and nev.)
Natural areas for schools
Verna R. Johnston · Conservation Education Section, State Dept. of Natural Resources
32 sayfa · 1959
Nature study / School natural areas / Outdoor education