Hugh,
Yes, please send me the pages if you don't mind. I looked for that book online but couldn't find it. There is a listing of Record Group 393 online on the Natl Archives website at http://www.archives.gov/research/guide-fed-records/groups/393.html but this is apparently different from the 'Preliminary Inventory....' book -- I presume it is just the headings and the book has a detailed list.

Maybe I'll make it up to DC one of these days. I'm sure it would fill in the gaps where I'm making suppositions now.

Ken