I don't think there are books for graduate level. If you have some background in history of economic thought, I guess you may read papers that focus on specific topics, such as the capital controversy, Japan's lost decades, or the great recession. Duke has a very good journal call "History of Political Economy" (HOPE).
If you prefer to read books, I have a few titles that focus on general topics:
* The Worldly Philosophers by Robert L. Heilbroner
* History of Economic Thought by E. K. Hunt
* Manias, Panics and Crashes: A History of Financial Crises, by Robert Z. Aliber
* A History of Post Keynesian Economics Since 1936, by J. E. King
* The Micro-foundations Delusion: Metaphor and Dogma in the History of Macroeconomics, by J. E. King