Look in both the reference section and in the regular stacks under ML132.B3 and ML128.B23 for band repertoire and band music bibliographies. Some of these are currently available digitally through HathiTrust. Here are some possibilities:
Band music guide : alphabetical listing of titles and composers of all band music. Evanston, Ill.: Instrumentalist Co., c1982. REF ML128.B23 B4 1982x. 1964 and 1975 editions available through HathiTrust.
Dvorak, Thomas L. Best music for young band / by Thomas L. Dvorak ; with the assistance of: Josh Byrd ... [et al.] ; foreword by Frank Ticheli ; edited by Bob Margolis. Brooklyn, N.Y.: Manhattan Beach Music, 2005. REF ML132.B3 D9 2005
Kvet, Edward J. Instructional literature for middle-level band / compiled and edited by Edward J. Kvet. Reston, VA: Music Educators National Conference, c1996. ML128.B23 I53 1996. Available through HathiTrust.
Nicholson, Chad. Great music for wind band : a guide to the top 100 works in grades IV, V, VI as selected by Frank Battisti ... [et al.] ; Chad Nicholson. Galesville, MD: Meredith Music Publications, 2009. REF ML132.B3 N624 2009
Rehrig, William H., 1939-. The heritage encyclopedia of band music : composers and their music / by William H. Rehrig ; edited by Paul E. Bierley. Westerville, Ohio: Integrity Press, c1991. 3 volumes. REF ML128.B23 R44 1991. Available through HathiTrust.
Renshaw, Jeffrey H. The American Wind Symphony commissioning project: a descriptive catalog of published editions, 1957-1991. New York: Greenwood Press, 1991. ML128.B23 R46 1991. Available through HathiTrust.
Wallace, David and Eugene Corporon. Wind ensemble/band repertoire. Greeley, CO : University of Northern Colorado School of Music, 1984. ML128.B23 W34 1984. Full-text search available through HathiTrust.
Nebraska State Bandmasters Association. Suggested literature. Available online.
Teaching music through performance in band. Chicago : GIA, 1997- 10 volumes. MT135.T43. Full-text search currently available through HathiTrust.
Teaching music through performance in beginning band. Chicago : GIA Publications, 2001-2008. 2 volumes. MT135.T433 2001.
M - scores
M1200-1270 -- Band music, for example ...
ML - books
ML1299-1354 -- History and criticism
MT - Musical instruction and study
MT733-735 -- Band instruction and study