Simple experiments illustrate the concept and characteristics of the circle.

Circles 1973, HarperCollins Children's Books

ISBN-13: 9780690002065

Trade paperback

Select
Circles 1971, HarperCollins Children's Books

ISBN-13: 9780690194302

Hardcover

Select
Circles, 1971, Crowell, New York, NY

ISBN-13: 9780690194319

Unknown binding

Select