I came across an interesting book in an used bookstore the other day. It is 'The Un-Marxian Socialist:A Study of Proudhon' by Henri De Lubac (Sheed and Ward, New York, 1948). The interesting thing is that the author is a Jesuit who actually !! has sympathy for Proudhon and who sees him as a "noble opponent". The book naturally concentrates on Proudhon's connection with religion-both pro and contra. Should be interesting to read some day.