Just to bring your attention to this high-quality book review of Michael Alpert's classical must-read work at the IIWW Military Operations Research Group blog (one that I strongly endorsed and you should follow in any case).
This book has an interesting story in itself:
The first edition was published in Spanish in the late 60's but not in Spain; this was the type of topic obvioulsy disliked by the Franco's regime censorship office!! The edition was undertaken by Ruedo Ibérico, a France-based editorial group run by a group of Spanish Republicans exiled in the country after 1939.
Incidentally, my father (who was not exactly a great Franco fan) used to "smuggle" books from this editorial any time he had the opportunity to travel abroad ... and I'm now a proud owner of a first edition copy :-)
A second and greatly updated edition, after the declasification of some of the Civil War archives, was released a few years ago... and yes this time it was publised in Spain.
Nonetheless, I must say that the English edition is surprisingly pricey (GBP 65!!), specially compared to the Spanish edition (€25) and I don't understand why the price differential; although the book is highly recommendable, think twice before commiting to such an investment.