| Oxbow Lake: Meander, Landform, Billabong, Deposition (Geology), Cut Bank, Secondary Flow, Point Bar, Erosion, River, Flood, Centripetal Force Год: 2010
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| Oxyhydrogen: Hydrogen, Oxygen, Molar Concentration, Properties of Water, Refractory, Welding, Combust, Autoignition Temperature, Stoichiometry, Atmospheric Pressure, Water Vapor Год: 2010
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| Papermaking: Paper, Fiber, Pulp, Cotton, Textile, Watermark, TAPPI, Paper Size, ISO 216, Bleaching of Wood Pulp, Coated Paper, Kraft Process Год: 2010
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| Parent: Mother, Father, Sexual Reproduction, Birth, Adoption, Offspring, Reproduction, Parental Testing, DNA Profiling, Parent?offspring Conflict, Parenting, Paternal Bond Год: 2010
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