1. U.S. Geological Survey (USGS) : FY2021 appropriations process and background / Anna E. Normand. In focus (Library of Congress. Congressional Research Service) Normand, Anna E. Washington, D.C. : Congressional Research Service, 2021. Book Online
2. Army Corps of Engineers : FY2019 appropriations / Nicole T. Carter. In focus (Library of Congress. Congressional Research Service) Carter, Nicole T. Washington, District of Columbia : Congressional Research Service, 2019. Book Online