Mary-Lou of the 
Chalet School

Click to see a larger image of the dustwrapper. On the right is a paperback edition.

1st published 1956 - dustwrapper by  D. Brook

1959 reprint ditto

1st pb pub 1968 1st style @ 2/6

Undated 2nd style @ 17.5p

Undated 2nd style @ 40p

1981 2nd style @ 85p

1985 2nd style @ £1.25

1989 3rd style @ £2.50

An Armada Three-In-One (New House, Three Go, Mary-Lou)
1st pub 1983
2nd style cover @£1.95