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Earth movements --- Soil mechanics --- Oregon
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Cratères lunaires. --- Lunar craters. --- Volcanoes --- Volcanoes. --- Volcans --- Oregon.
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Grasses --- Legumes --- Roadside improvement --- Roadside plants --- Soil stabilization --- Oregon
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Diseases and pests --- Douglas fir --- Douglas fir beetle --- Oregon --- Washington (State)
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North America --- Oregon --- fossils --- geographical distribution --- habit photographs --- habitat photographs --- microfloristics --- paleoecology --- taxa descriptions --- taxonomy --- Bacillariophyta = Diatoms = Diatomeae
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Forests and forestry --- Oral histories --- Oregon State University --- School of Forestry --- Social life and customs --- British Columbia --- Northwest, Pacific
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