From the Lion's Heart: Hummel, Randy: 9781441594778: Amazon.com: Books
HUMMEL - Hummel: Complete Piano Trios - Amazon.com Music
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Hui Die Hummel!: Hummel, Berta: Amazon.com: Books
Die zauberhafte Welt der M. I. Hummel Figuren / The Fascinating World of M. I. Hummel Figurines: Amazon.com: Books
Hummel Concerto in Eb Major for Bb Trumpet and Piano: Books - Amazon.com
The Hummel-Book: Berta Hummel, Margarete Seemann: Amazon.com: Books
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Through Hazel Eyes: Heather Hummel: 9780977623280: Amazon.com: Books
Official Price Guide to Hummel Figurines and Plates,1986 Sixth edition: Amazon.com: Books