Well I have a book by that title. Yep Silver Burdett pub. too. 1971. I don't want to sell it but maybe can help you to track another down. Trouble is, how can you tell what grade it is for? Joe mentions book numbers too and I see inside there is a list of contributors for books 3-6 but I don't see a number identifying this one. It has about 250 pages and at one time was my only source for the words to "the Zebra Dun".

Rex