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Earth and the Environment
Ecology and Environmentalism
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Environmental Studies
residence time
resorb
respiration-biomass ratio
restriction fragment length polymorphism
reticulate
Reuse
Ribbons
rice stunt
Richter denudation slope
ridge and runnel
ridge crest
ridge-and-ravine topography
riegel
riffle
rim
ring species
Rip Current
riparian
ritualization
rival
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Earth and Environment
History
Literature and the Arts
Medicine
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Philosophy and Religion
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Plants and Animals
Science and Technology
Social Sciences and the Law
Sports and Everyday Life
Additional References
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