The Observer's Book of Wild Animals of the British Isles is a non-fiction book that is part of a larger series known as "The Observer's Books". The book in the image was compiled by W. J. Stokoe and revised by Maurice Burton, D.Sc., and was published by Frederick Warne & Co. Ltd..
The book is an illustrated guide describing 64 species of wild animals found in the British Isles, with 72 illustrations, 46 of which are in full color.
About the Book Series
Publisher: Frederick Warne & Co. Ltd., a British publishing house founded in 1865. The company is also well-known for publishing the works of Beatrix Potter.
Series: The Observer's Books are a popular series of small, pocket-sized reference books on a wide range of subjects, including natural history, transport, and art.
Collectibility: The books have become highly collectible, with some early editions in good condition fetching significant prices. The series first launched in 1937 with titles on British birds and wild flowers.