Agricultural systems -- History. / https://id.loc.gov/authorities/subjects/sh85002407 https://id.loc.gov/authorities/subjects/sh99005024 : Manning, Richard,
Agricultural systems -- Research -- United States -- Congresses. / https://id.loc.gov/authorities/subjects/sh85002407 https://id.loc.gov/authorities/subjects/sh2002006576 https://id.loc.gov/authorities/names/n78095330-781 https://id.loc.gov/authorities/subjects/sh99001533 : National Academies (U.S.).
2012
1
13
Agricultural systems -- South Asia. / https://id.loc.gov/authorities/subjects/sh85002407 https://id.loc.gov/authorities/subjects/sh85125541-781