1960's biology book. Illustration by Charles Harper.The book is "Learning with Colour - Biology - A colourful Introduction to the Wonder of Life" by Gerald Ames and Rose Wyler. Published by Hamlyn Publishing Group Ltd., Feltham, Middlesex, 1961.
Pull by Kate Callan. Paper, string. 4″ x 4″ Pull contains eight explorations of string formations when fully open. Some strings continue through the pages making it impossible to view more than one page at a time.