Subject(s): Procter, Joan | London Zoo (London, England) -- Juvenile literature. | Zoo keepers -- Biography -- Juvenile literature. | Reptiles -- Research -- Juvenile literature. | Juvenile Nonfiction -- Animals -- Reptiles & Amphibians. | Juvenile Nonfiction -- Biography & Autobiography -- Women. | Juvenile Nonfiction -- Science & Nature -- Zoology. | England. | Picture books for children. | Biography | Biographies. | picture books. | Juvenile works. | Picture books.