Hi, I didn't find the Decker book listed in the Genealogical Helper but The address & phone is listed below for you, If they advertised the book in the past chances are you may still be able to purchase it , Good Luck, debbie Higginson Book Company 148-GH Washington St. Salem, MA 01970 Tel, 978-745-7170 fax, 978-745-8025 E-mail, [email protected]