Alan Marshall (1902 - 1984) was born in Noorat, Australia. At the age of six, he went down with polio, which left him, as it left so many others in that pre-vaccination age, with physical difficulties that remained with him throughout his life, and which eventually led to the amputation of his right leg. His book I Can Jump Puddles (1955) was, in essence, the story of his childhood: a happy time where despite his disability, he learned to swim, and to ride. The book was reprinted many times, and is still in print today.
I Can Jump Puddles was not his only book: it had two sequels. He also wrote articles and short stories, and collected and published indigenous Australian tales.
Finding the book: easy. It has been reprinted many, many times, and I’m sure there are more editions out there than I have listed.