I would also highly recommend Richard Hull's "Tesla Coil Builder's 
Guide to the Colorado Springs Notes".  It goes over the CSN on a 
day-by-day basis, adding Richard's insights and comments, and it 
really brings a lot of information into focus (at least it did for me).  I 
would even recommend it without the CSN, since it contains a lot of 
valuable information drawn from the TCBOR's regular and magnifier 
coil research (and a lot of neat pictures of the TCBOR's magnifiers).