This is "The Willow Whistle" by Cornelia Meigs, in a first edition published by Macmillan in 1931. This edition features a tale of the West for young people, with charming color frontispiece and b/w illustrations by E. Boyd Smith. Condition of this book is Very Good Minus, showing wear to the corners and spine ends. One of the full-page b/w illustrations has been tastefully colorized with watercolors. No dust jacket. Please see my other vintage children's book listings.