Formerly Almanac of American Politics. Biennially-published non-partisan guide to the members of the U.S. Congress and the areas they represent. (Search for name or place.)

2018 edition (115th Congress). This biennial compilation from Congressional Quarterly provides information on the current members of the U.S. Congress and their states and districts.

Chronologically-arranged seven-volume set (2010) on "the events, policies, activities, institutions, groups, people, and movements that have created and shaped political life in the United States." Note: The above link takes you only to Volume 1 (1500-1783). Links to additional volumes:
Volume 2 (1784-1840) * Volume 3 (1841-1877) * Volume 4 (1878-1920) * Volume 5 (1921-1945) * Volume 6 (1946-1975) * Volume 7 (1976-2009)

Two-volume encyclopedia (2009) contains nearly 190 entries, written by over 130 historians and other scholars, covering "both the traditional topics of political history -- such as eras, institutions, political parties, presidents, and founding documents -- and the wider subjects of current scholarship... " [ preview ]

Five-colume set (2010) was prepared with the assistance of the American Political Science Association. It contains about 1,500 alphabetically-arranged, signed entries (including one contributed by Washington and Lee Professor Mark Rush) on "political theories, concepts, research frameworks, and political practices from across the world."

Revised edition (2010) contains about 700 alphabetically-arranged signed entries, most contributed by members of the American Political Science Association's Presidency Research Group. Includes several entries contributed by Robert Strong, W&L Professor of Politics.

Guides to individual presidents (Madison, Washington, Jefferson, etc.). Series in-progress.

Third edition (2008) "considers how presidential leadership depends on its ability to gain the support or acquiescence of key constituencies outside government," including political parties, the mass media, public opinion, interest groups, and popular culture.

Includes statistical coverage of public approval of the president, elections, vetoes, executive orders, foreign affairs, the executive branch, congressional and judicial relations, public appearances, and much more" on the office of the president from George Washington to George W. Bush.

Enormous collection of documents, media, etc. about the U.S. Presidency. From the University of California -- Santa Barbara.

Created by the Miller Center of Public Affairs at the University of Virginia, this is a non-partisan resource on the U.S. presidency, with essays on each administration.

This is the third edition (2003) of the most comprehensive encyclopedia on American history, comprising ten volumes in printed form. The 4,400 signed articles range in length up to 7,000 words. [ preview ]

Compilation of documents important to the development of constitutional government in the U.S
The printed multi-volume set is available in the library collection.