Swallowdale paperback reprint 1997
First published 1985. Known in the U.S. as "trade paperbacks", these volumes are as large as the hardback editions. Still available in the U.S.
1997 price $14.95
The title pages include the "Author's Note" claiming that the Swallows and Amazons story came solely from Ransome's own childhood. Full details of the first edition here.