Might it be this book?
http://www.abebooks.com/products/isbn/9781870601511
The most complete description lists it as soft cover of 47 pages published in 1988.
It doesn't just cover Dominican P-51s though:
Quote:
Warbirds Worldwide Special Edition, Includes: Dominican P-51s, TF-51 Programme, Flying the P-51, Mustang cockpits, Rebuilding a P-51A
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Cheers
Mark