I don't think there is a single book concerning pigeon racing which can be singled out as full of answers. I would have an opinion that, say out of a book with 200 pages, 2 or 3 may have the info I can take on board. Many writers equals many titles ! Some of them are factual and the contents can't really be argued with. The 2 volumes of Feed to Win are an example. Stacks of facts, but ultimately it's down to the fancier to use at their discretion. Anyone having an interest in pedigrees and historical blood lines of Belgian racing pigeons should have the Jules Gallez books. And so it goes. Many books, many ideas , many theories ! Favourites of mine : Advanced Techniques....Jan Aerts The Four Seasons Pigeon Lore