W. H. Langer grāmatas
Estimating Los Angeles degradation value using the Schmidt rebound hammer along the Front Range, Colorado: USGS Open-File Report 98-331
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The human factor in mining reclamation: USGS Open-File Report 98-523
B. F. Arbogast, D. H. Knepper, W. H. Langer
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The Human Factor in Mining Reclamation Usgs Open-File Report 98-523 - Scholar's Choice Edition
B. F. Arbogast, D. H. Knepper, W. H. Langer
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