Presidential Claims of Executive Privilege: History, Law, Practice & Recent Developments is a CRS report recently updated. It includes an Appendix listing claims of executive privilege from the Kennedy administration through the George W. Bush administration.
We read about claims of executive privilege in the news and this report provides a good basis for understanding the issues.
The Congressional Research Service (CRS) works for the U.S. Congress providing policy and legal analysis. CRS is well known for analysis that is authoritative, confidential, objection and nonpartisan.
Ernster, the Virtual Library Cat
Above the Law - A Legal Tabloid - News, Gossip, and Colorful Commentary on Law Firms and the Legal Profession