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Bulletin, Issues 64-68
Bok av California State Mining Bureau
Third Annual Report of the State Oil and Gas Supervisor of California fo...
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Bulletin, Issues 20-41
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Bulletin of the Maryland Agricultural Experiment Station, Issues 31-60
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Bulletin, Issues 24-53
Bok av University of Idaho College of Agricult
Bulletin, Issues 90-124
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Farmers' Bulletin, Issues 851-875
Bok av United States Dept of Agriculture
Bulletin, Issues 110-128
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Bulletin, Issues 85-88

Bok av California State Mining Bureau