And Timothy Too. . Blackie & Son: London & Glasgow, 1934.
Leap Year Born. pp. 281. Blackie & Son: London & Glasgow, 1935.
Mary Plain and the Twins... With illustrations by Irene Williamson. Routledge & Kegan Paul: London, 1952.
Mary Plain and the twins, illustrated by Janina Ede. Leicester : Knight Books, 1970. Series:.
Mary Plain goes bob-a-jobbing... With illustrations by Irene Williamson. Routledge & Kegan Paul: London, 1954.
Mary Plain goes to America... With illustrations by Irene Williamson. Routledge & Kegan Paul: London, 1957.
Mary Plain goes to America; illustrated by Janina Ede.Leicester : Knight Books, 1971. Series: A Red Knight book)
Mary Plain Home Again... With illustrations by Irene Williamson. Routledge & Kegan Paul: London, 1949 .
Mary Plain in Town... With illustrations by Irene Williamson. Cobden-Sanderson: London, 1935.
Mary Plain in Trouble... With illustrations by Irene Williamson. G. Routledge & Sons: London, 1940.
Mary Plain in War-Time, etc. G. Routledge & Sons: London, 1942.
The Mary Plain omnibus; illustrated by Irene Williamson. London : Routledge and Kegan Paul, 1976. Contents: Mostly Mary - All Mary - Mary Plain in town - Mary Plain on holiday.
Mary Plain on Holiday... With illustrations by Irene Williamson. Cobden-Sanderson: London, 1937.
Mary Plain on holiday; illustrated by Janina Ede. London : Knight Books, 1969. Series: A red knight book
Mary Plain to the Rescue. With illustrations by Irene Williamson.Routledge & Kegan Paul: London, 1950.
Mary Plain to the rescue; illustrated by Janina Ede.Leicester : Knight Books, 1971. Series: Red knight book
Mary Plain, V.I.P.... With illustrations by Irene Williamson.. Routledge & Kegan Paul: London, 1961.
Mary Plain's Big Adventure... With illustrations by Irene Williamson, G. Routledge & Sons: London, 1944
Mary Plain's big adventure; illustrated by Janina Ede.,Leicester : Knight Books, 1970. Series: Red Knight book
Mary Plain's "Whodunit"... With illustrations by Irene Williamson. Routledge & Kegan Paul: London, 1965.
Mostly Mary... Illustrated, etc. E. Mathews & Marrot: London, 1930
Mostly Mary With illustrations by Irene Williamson, Cobden-Sanderson: London, 1938.
Mostly Mary, illustrated by Janina Ede. Brockhampton P, 1968. Series: Red Knight books.
Mostly Mary, with illustrations by Irene Williams. Rev. ed. London: The Owl Man, 1995.