If you want a serious B-25 manual then in my mind the best one is the B-25C and D maintenance manual.

(Image shamelessly stolen from eBay)
A lot of the information and systems will cross over to later H and J but this is the best manual I have come across for pure technical information, illlustrations and awesome artwork.
This manual is a North American Factory produced manual that is beautifully written and illustrated that beats the military manuals hands down. Most of the NAA factory manuals, and Boeing factory manuals too, are great works of art and a solid investment.
You can find the NAA B-25 C/D maintenance manuals in many formats these days from originals to copys to electronic versions on CD's. It is a very large book over 4 inches thick,m 700 some pages as I recall, of wonderful inmformation. Here is a link to some originals and copies avaiulable on eBay:
http://shop.ebay.com/i.html?_nkw=b-25c+maintenance+manual&_sacat=0&_odkw=b-25c+maintenance+manual&_osacat=0&_trksid=p3286.c0.m270.l1313&_rdc=1They are spendy at $200+ per original but to me it is worth is as they are chocked full of color. A color copy would run a lot more than that. These are not terribly rare manuals as a lot must have beren produced and they show up regularly for sale. Condition sure varies so if you are going after an original then be sure it is in good shape as the spine can be weak with age on such a large manual. They originally came in an OD canvas carying case with two handles slipped on it like a dust jacket but finding these original covers is very rare.
This guys CD looks like it is a good one with 20 B-25 manuals including the one mentioned above. $28 for the CD:
http://cgi.ebay.com/DVD-ROM-20-MANUALS-B-25-BILLY-MITCHELL-BOMBER-/120657475789?pt=LH_DefaultDomain_0&hash=item1c17bef8cdYou can't beat the original manuals for the details and technical information we seek as most books published these days can't go into this kind of detail without putting most of the readers to sleep.
I hope this helps,
Taigh
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Taigh Ramey
Vintage Aircraft, Stockton, California
http://www.twinbeech.com'KEEP ‘EM FLYING…FOR HISTORY!'