High Quality Content by WIKIPEDIA articles! The Observer`s Books were a series of small, pocket-sized books, published by Frederick Warne Co in the United Kingdom from 1937 to 2003. They covered a variety of topics including hobbies, art, history and wildlife. The aim of these books was to interest the observer and they have also been popular amongst children. Some of them have become collector`s items. For the dedicated collector this could be a lifetime`s work as there are over 800 variations, some of which are now very rare. The values of the books can vary from 50 pence to hundreds of pounds.