Comptonology is a really wonderful resource and well worth the money. It's $55.00 for the whole set which comes in a binder and for an additional $15/yr you will get updates. I believe the contact person is William Compton at 6005 Green Valley Rd Knoxville, TN 37914 www.aimsinc.com/EnglishScottish This was one of the best research tools I bought for my Compton research. Eileen