Looking for books about the trombone? Here's some suggested ones:
The Buddy Baker Tenor Trombone Handbook
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Originally published: Austin, Tex. : International Trombone Association Manuscript Press, University of Texas at Austin, 2001.
" ... [T]his handbook ... is composed of selected 'handouts' ... developed over the 40 years I taught at the university level ..."--Preface.
"Designed to be used with the Buddy Baker tenor trombone method."
The Magnificent Bone: A Comprehensive Study of the Slide Trombone
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Here are some journals about the trombone: