Green Grass of Wyoming is a vintage hardcover book written by Mary O'Hara in 1946. It is a classic piece of literature and fiction that has stood the test of time. The book was published by J. B. Lippincott & Co. in the United States, making it a great addition to any collection of North American literature. The book is in its original printing, making it a true gem for collectors. The book's topic revolves around classics and is a must-read for anyone who loves literature.