The best is issue 34 of AFV Modeller, which has a construction article on the Dragon M2 kit, as well as a history of the M2 and a photo walk-round giving lots of interesting shots of suspension, storage etc.
Cover price is 6 ukp but I picked it for less than half that, inc postage.
Another bargain is American Tanks of World War II, by Thomas Berndt. This has articles on both the Sherman and M2/M3 halftracks, with lots of colour photos of restored vehicles. A risk using these as references but it does pick up on some of the restorers' errors.
The other two which arrived today are the Squadron M3 Half-Track in Action and the Concord US Half-Tracks in Combat, both of which are chock full of period black and white photos.
Roll on Christmas



Adrian.