Here’s the abstract for William Baude & Jud Campbell, Early American Constitutional History: A Source Guide (Oct. 31, 2018): “This is a concise guide to source materials relevant to late 18th-century and early 19th-century constitutional history in the United States, often with accompanying reflections about using these sources in historical and legal scholarship. The guide aims to be useful to those who are just entering the field as well as to more established historians and lawyers who want to keep up with newly available sources.” Recommended.