The Making of Modern Law: Foreign Primary Sources, 1600–1970, which complements the collection of treatises found in The Making of Modern Law: Foreign, Comparative, and International Law, 1600–1926, provides through monograph publications an interpretive analysis of various legal codes, the "primary sources" of law. (Note that the term "primary sources" is used not in the historian's sense of a manuscript, letter or diary, but rather in the legal sense of a case, statute or regulation.) Jurisdictions include Great Britain, Ireland, France, Germany, Austria, Switzerland, as well as other countries in Northern and Eastern Europe.    

Of interest to historians is the inclusion of texts in Western languages on significant topics, such as Ausfurhliches handbuch uber den Code Napoleon (1810) and Motivi, Rapporti, opinioni e discorsi — per la formazione del codice napoleone (1838-1849). Half of the titles in this collection are in English, with a large British component that includes Public General Acts from 1801 to 1922.

The Making of Modern Law: Foreign Primary Sources, 1600–1970 is available in two parts.

Part I: 1600-1970 comprises over 650 titles spread across nearly 2,000 volumes, all totaling nearly 1.4 million pages. It includes regulations, session laws, journals, and codes and commentaries. Researchers will find works related to the administration of justice, civil procedure, commercial law, criminal law and procedure, customary law, forestry and agricultural law, maritime law and military law, among others. The bulk of the collection is devoted to the laws and legal histories of France, German, and Great Britain (and Ireland). Researchers will also find smaller collections of materials focused on Austria, Belgium, the Netherlands, Russia, and Scandinavian countries.

Part II: 1600–1970 contains approximately 1.4 million pages from nearly 1,500 titles spread across almost 2,700 volumes. Works cover canon law codes and commentaries; materials on civil law and procedure, commercial law, criminal law and procedure; and Roman law codes and commentaries. It also includes commentaries from a broad array of nations, such as Australia, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, Egypt, El Salvador, Guatemala, Honduras, India, Jamaica, Netherlands, New Zealand, Nicaragua, Panama, Paraguay, Peru, Portugal, Uruguay, and Venezuela. There are especially large caches devoted to Argentina, Canada, Italy, Mexico, and Spain.