Hi, My name is ***** ***** it is my pleasure to assist you. To be a 100% sure about your books being a first edition without having a dust jacket and not seeing the book in person I recommend the following books, the value of your 2 books if they turn out to be first editions ranges from $320 to $520 + each depending on condition. The dust jacket is the key the original cost of the first editions were $1.95 each. Even having the copyright being 1963 there is several revised editions after 1963 but still carry the copyright of 1963. I hope this helps you. Thanks Mike
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Any person seriously in the market for Dr. Seuss books should also own a copy of First Editions of Dr. Seuss Books (2002), by ***** *****er, ***** *****er, and Dan Hirsch. Within the hobby, this book is considered the definitive guide to correctly identifying Dr. Seuss first edition books, providing detailed information on each book, along with full color examples of books and dust jackets. Given the cost of making a mistake with Dr. Seuss first editions, the Younger/Hirsch guide is an invaluable resource.
Second book is The Children's Picturebook Price Guide provides values for nearly 23,000 books, covering over 700 children's book illustrators dating from 1929 to 2006. For owners of picturebooks, the price guide is an essential tool to identify and assess their value.