The mystery of the several sevens

Mr. Merlin, a wizard disguised as a substitute teacher, magically transports two fifth graders to a fairyland where they must solve a riddle to find out who has stolen the seven dwarfs' bag of diamonds.

HarperCollins
1994
9780060244590
book

Holdings

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9425439730152268981620227LIVE285T 30719FIC BRI100015754856551709567815
225233658025191276981620227LIS287T0016901FIC BRI100016101181161615914811
291445963918761546981620227NWE351NRE0010651FIC100016377825731637782573
3119219655784515639816202279298T 21869FIC BRI100016407292551640729255
311922065578451563981620227929830009000427513FIC BRI100016407292551640729255
379708271107042136981620227NWE350NRE0010651FIC100016950443851695044385