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NIU Collection, Segment 5

SEGMENT: CHANGES IN FARMING METHODS, ACTIVITIES, & ORGANIZATIONS: Audio duration 08:19
Diversification to Specialization & Increased Use of Fertilizers: duration 01:43



UIS Collection, Segment 21

SEGMENT: FARM-EQUIPMENT, FARMING METHODS, & ENVIRONMENT: Audio duration 12:23



UIS Collection C-G, Segment 8

From Burning & Crop Rotation to Disking & Fertilizing: duration 01:36



UIS Collection K-M, Segment 17

SEGMENT: FARMING METHODS: Audio duration 07:46