Susan Dimock (York University) has posted
St. Thomas Aquinas, Law for the Common Good (Classic Readings and Canadian Cases in the Philosophy of Law, S. Dimock, ed., Prentice Hall, 2002) on SSRN. Here is the abstract:
This article incorporates substantial passages from Thomas Aquinas’s Summa Theologica on law, within a broader discussion of many enduring philosophical questions and debates about the nature of law, the obligation to obey law, the relationship between morality and law, the authority of lawmakers, etc. It is intended primarily as a teaching tool.