Cover image not available
Forty-five cards (90 sides) and [6],34p. teacher's guide in box. Card size varies.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
Countdown : infant number scheme by Constance Thorpe. ISBN 0050020021. Published by Oliver and Boyd in 1970. Publication and catalogue information, links to buy online and reader comments.