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In page The Wonderful Adventures of Nils:

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Lev Grossman's fantasy novel The Magicians includes numerous allusions to earlier works such as The Narnia Series and the Harry Potter books. The influence of Nils Holgersson is evident[citation needed] in a key episode where a class of students nearing graduation from a School of Magic are set a major test: to be transformed into wild geese and undertake an epic flight, all the way from Upper New York State to Antarctica.