dear Spanienflieger,
I'm Italian aviation enthusiast, particularly intersted in the operations of Regia Aeronautica in the early part of W.W. II.
I posses copy of "Uomini nei cieli" in its 1981 edition (and of many other books about Regia Aeronautica if you need other information).
I'm not an expert of Spanish civil war operations but I have to tell You that in my opinion this book is not at all a good source for this topic.
The part it devoted to Spanish civil war is only a mere eleven pages from 277 to 287, four of them of photos (not connected with this topic) out of the 666 pages of the book. The information in the seven remaining pages are really poor and devoid of any form of detail.
However if You are interested You can probably still buy the book (new) for 16 € plus P&P by the Italian bookseller Tuttostoria,
www.tuttostoria.it.
Kind Regards
Ludovico