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NIU Collection, Segment 2

SEGMENT: FARM BUSINESS & CHANGES IN FARMING METHODS: Audio duration 11:06
Improve Hybrid Corn Yields: Add Fertilizer & Pesticides: duration 00:31



NIU Collection, Segment 5

SEGMENT: CHANGES IN FARMING METHODS, ACTIVITIES, & ORGANIZATIONS: Audio duration 08:19



NIU Collection, Segment 12

Reflections of Changes in Farm Work & Productivity: duration 01:16



NIU Collection, Segment 18

SEGMENT: CROPS, WEATHER, & ENVIRONMENT: Audio duration 09:17