Congdon Cousins,
My maternal grandmother was Harriet Elizabeth Congdon,first wife of James Bard Bill.My third cousin Earl Perry Crandall has to be the ultimate Congdon source!He is the author of an outstanding Congdon genealogy published by Higginson's of Salem,Massachusetts.I was honored to be one of two people he dedicated the book to.We both have a George Congdon who I ASSUME might be the one you are talking about.Contact Earl at P.O. Box 1234,Hudson,NY 12534,.Also visit his listing at <http://my-ged.com>; and go to the Crandall gedcom and do a search on both of us.Our Congdon ancestry is listed there.
If you contact Earl by regular mail kindly enclose a SASE.
Relatively yours,
Scott Bill Hirst