Though mentioned, the concept of Public Reason isn't expanded until the author's clarification of this work, the similarly titled "Justice as Fairness", where the author re-explains the difference principle, the liberty principle and the Veil of Ignorance.  
Chapters in it include "Intuitionism", "The Problem of Unity" and one discussing the problem of the titular concept between different generations. Its Duty and Obligation section addresses things like "The Role of Civil Disobedience", and the revised edition's introduction notes the difference in the title concept in welfare states and property-owning democracies.  Martha Nussbaum's "Women and Human Development" is one of many direct responses to this book, with others by Amartya Sen and Michael Sandel, along with a famous refutation premised on Entitlement Theory meant to justify the minimal state. Though mentioned, the concept of Public Reason isn't expanded until the author's clarification of this work, the similarly titled "Justice as Fairness", where the author re-explains the difference principle, the liberty principle and the Veil of Ignorance.  FTP, identify this philosophical classic, a 1971 work by John Rawls.
Chapters in it include "Intuitionism", "The Problem of Unity" and one discussing the problem of the titular concept between different generations.
{Theory of Justice}