Plows and Bubbles
Clip: Season 1
Learn about the two types of plows farmers used.
Aired: 11/18/12Video has closed captioning.
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Funding is provided by Bank of America, Corporation for Public Broadcasting, The Arthur Vining Davis Foundations, National Endowment for the Humanities, The Rockefeller Foundation, Wallace Genetic Foundation and members of The Better Angels Society, including the Dana A. Hamel Family Charitable Trust and Robert and Beverly Grappone.