Agriculture

U.S.D.A.

Agencies of the USDA (a list)

AGRICOLA, National Agricultural Library catalog (for items found here, check HOLLIS or search the web for full text).

Agricultural Cooperative Extension System: An Overview (County-based education system.  This guide by the Congressional Research Service)

Crop Categories, USDA Economic Research Service

Yes, That's Part of the USDA:

• Aquaculture (Fish and Seafood Farming)
• Forest Service (National Forests and Grasslands)
• Hemp Production (low-THC)
• Opiod Misuse in Rural America
• Rural Business-Cooperative Service
• Rural Development
• Rural Housing Service
• Rural Utilities Service
• Supplemental Nutrition Assistance Program (SNAP, "Food Stamps")

Surprise, not part of USDA:

• Bureau of Indian Affairs, Branch of Agriculture and Rangeland Development
• Bureau of Reclamation: Certain Dams, Hydroelectric, and Irrigation 
• Nutrient (fertilizer and manure) pollution reduction includes the Environmental Protection Agency
• Federally-authorized Cultivation of Marijuana
• Pesticide Registration and regulation (Environmental Protection Agency)