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Ovaries --- Physiology --- Research.
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Patent offices. --- Patent offices. --- Patents. --- Patents. --- Research. --- Research.
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Geology, Stratigraphic --- Paleontology --- Limestone --- Research
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Geology, Stratigraphic --- Paleontology --- Limestone --- Devonian Geologic Period. --- Paleontology. --- Research
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Geology --- Geological surveys --- Geography --- Geology, Stratigraphic --- Mines and mineral resources --- Coal --- Coal. --- Geological surveys. --- Geology. --- Mines and mineral resources. --- Research --- Research. --- Alaska. --- Alaska, Southeast.
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Geology --- Geological surveys --- Geography --- Geology, Stratigraphic --- Mines and mineral resources --- Coal --- Research --- Alaska. --- Alaska, Southeast.
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Geological surveys --- Geology --- Coal mines and mining --- Research --- Matanuska River Valley (Alaska) --- Surveys --- Coal mining --- Collieries --- Energy industries --- Mines and mineral resources --- Geognosy --- Geoscience --- Earth sciences --- Natural history --- Matanuska Valley (Alaska) --- Mat-Su Valley (Alaska)
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