When Congress Comes Calling: A Primer on the Principles, Practices, and Pragmatics of Legislative In
http://www.constitutionproject.org/manage/file/175.pdf
Covers the tools and powers available to Congress for carrying out oversight investigations, lessons to be learned from executive branch investigations, and the rights and roles of the minority party and individual committee members. Not a government document but written by a former staff member of the Congressional Research Service. From the Constitution Project.
