1964 "First published in 1964 by The Viking Press, Inc." stated on copyright page; The Viking Press publishers, New York; hardbound; very good condition with unmarked pages; boards have light wear - see pics.
 
Description -
In this charming sequel to The Snowy Day, an older and wiser Peter wants to learn to whistle. Wouldn’t it be the perfect way to call his dog Willie? Peter tries so hard to whistle that his cheeks hurt, but he doesn’t give up. With a very light hand and his legendary illustrations, Keats creates a world in which effort yields results.