Green, Alison. What can you stack on the back of a yak? / by Alison Green. - 1st ed. - London : Alison Green Books : Scholastic Children's Books, 2013. - unpaged : ill., col. ; 27 x 26 cm. K-3. ISBN: 9781407139005 Subjects--Topical Terms: Children's stories.Ducks--Pictorial works--Juvenile fiction.Stories in rhyme.Yak--Pictorial works--Juvenile fiction. Dewey Class. No.: EF GRE /I