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Back issues of scholarly journals and scholarly books across many disciplines. This can be used only for finding older materials because there is a 3-5 year lag in currency.
Find in-depth summaries of congressional trends, actions, political and policy controversies, organized by Congressional term and policy topic. This covers 1945-2016.
Substative background information about the laws, institutions, and actors that have governed America throughout its history, covering topics like from presidents and Supreme Court justices to specifics of policy history, critical legislation, and party formation. This is a great source for gaining context about your topic.
Princeton Encyclopedia of American Political History
The Oxford Handbook of American Political Parties and Interest Groups
The Oxford Encyclopedia of American Political and Legal History