книга за малетките а този ето го хахаха най красивия

The book is competent, with some technical depth and welcome opinion, well-written and I presume quite accurate and complete. It is dated, if you are used to color photos.
It is not as inspiring as the author's book on Garratt's, which I liked very much, possibly because of the author's stated preference for those (excellent) machines. Its color photos may have helped. It has copyright "69, 81," whereas the Mallett book has 75.