The University of Minnesota Press has a nice line up of most of Wanda Gag's books including a reissue of two of the titles that have always been a little harder to find, Tales from Grimm and More Tales from Grimm. These collections are a nice introduction to the Grimm tales for younger children with some of the dark strains of the original Grimm tales lightened but without being bowdlerized.
Edward Ardizzone was a talented illustrator (illustrating more than 150 books) who ended up also writing a much-loved series of books about a young boy, Tim, and his various seaside/sailing adventures. There are eleven stories in the series, published between 1936 and 1977, eight of which are now, with these three titles reissued (Tim all Alone, Tim and Charlotte, and Tim in Danger), in print. The other five are Tim to the Rescue, Tim to the Lighthouse, Tim and Ginger, Tim and Lucy Go to Sea, and Little Tim and the Brave Sea Captain.
Perfect for any adventure loving child, anyone interested in the sea, and for children who want to see a model of other children functioning independently (though often improbably) in an adult's world.