Cold, colder, coldest by Dahl, Michael
Fast, faster, fastest by Dahl, Michael
Deep, deeper, deepest by Dahl, Michael
Do frogs have fur? by Dahl, Michael
Old, older, oldest by Dahl, Michael
Do penguins have puppies? by Dahl, Michael
Hot, hotter, hottest by Dahl, Michael
Do goldfish gallop? by Dahl, Michael
Sit! Stay! Laugh! by Dahl, Michael