This is one of a series of books set in the Australian bush, recounting the adventures of the Linton family living on a station called "Billabong". The saga stretches from 1910 to 1942, with the tumult of the period reflected in these incident-packed books.
Used availability for Mary Grant Bruce's Jim and Wally
1981 : UK Hardback
Title: Jim and Wally (Billabong series)
Author(s): Mary Grant Bruce
ISBN: 0-7063-4249-6 / 978-0-7063-4249-9 (UK edition)
Publisher: Ward Lock
July 1992 : UK Paperback