You looked through your 1802 stuff and didn't find a single reference to any 1801 literature? Often just having the reference lets you go to the local EE department and find the appropriate volume in their library (Many departments do have books going back to the early 70's) or in the personal library of one of the faculty members. Unfortunately, little of this stuff is in an online database anywhere, so you really have to do the legwork to track it down. I spent most of my academic career doing such legwork - it's been decades since many of the best tables of thermal neutron cross sections have been published, and I found many of them in dusty corners of little- used labs. Incidentally, I found my HP9100B while searching dusty corners for neutron cross section tables :-). -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927