"How Green Was My Valley" is a novel by Richard Llewellyn, published in 1939. It tells the story of a young boy named Huw Morgan growing up in a Welsh mining community during the early 20th century. The narrative explores themes of family, community, and the impact of industrialization on rural life. The book is notable for its vivid descriptions of the Welsh landscape and the struggles faced by the mining families. It highlights the close-knit relationships within the Morgan family and the challenges posed by economic hardship and social change, ultimately reflecting on the loss of innocence and the passage of time.