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: Changes In Environment
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Clip Search: 1960-1970, Changes In Environment

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NIU Collection, Segment 17

SEGMENT: FARMING METHODS, LAND, & REFLECTIONS: Audio duration 08:58



NIU Collection, Segment 18

SEGMENT: CROPS, WEATHER, & ENVIRONMENT: Audio duration 09:17
Without Crop Rotation Wildlife Has Declined: duration 00:33



UIS Collection C-G, Segment 11

The River Has Gotten Cleaner: duration 00:53