The entire text of Fr. Joseph Dirvin’s classic book on Catherine Laboure is available on the EWTN website.It includes the 1958 forward by Fr. Joseph Skelly, CM
http://www.ewtn.com/library/MARY/CATLABOU.htm
For more Marian Resources visit the site of the Central Association of the Miraculous Medal at http://www.cammonline.org/
and the Association of the Miraculous Medal at http://www.amm.org
