Annie Proulx, one of America's finest writers, invites us to share her experience in the building of her new home on a rich plot of untouched, unspoilt prairie and her pleasure in uncovering of the layers of American history locked beneath the topsoil.'Bird Cloud' is the name Annie Proulx gave to 640 acres of Wyoming wetlands and prairie and 400 foot cliffs plunging down to the North Platte River....