Look in both the reference section and the regular library stacks under ML128.O5 for bibliographies and repertoire lists for orchestra. Some of these are currenlty available digitally through HathiTrust. Here are some possibilities:
Daniels, David. Daniels' orchestral music. Lanham, Maryland: Rowman & Littlefield, 2015. REF ML128.O5 D3 2015
Koshgarian, Richard. American orchestral music: a performance catalog. Metuchen, NJ : Scarecrow Press, 1992. ML128.O5 K67 1992. Available through HathiTrust.
Manning, Lucy. Orchestral "pops" music: a handbook. Lanham, Maryland: The Scarecrow Press, 2009. REF ML128.O5 M36 2009. Available through HathiTrust
Meyer, Dirk. Chamber orchestra & ensemble repertoire: a catalog of modern music. Lanham, Maryland: The Scarecrow Press, 2011. REF ML128.O5 M49 2011
Teaching music through performance in orchestra. Chicago : GIA Publications, 2001- Vols. 1-3. MT125 .T2535 2001. Full text search currently available through HathiTrust
Symphony. ML1.S967
M - Scores
M1000-1075 Music for orchestra and concertos with orchestra, for example ...
M1100-1160 Music for string orchestra and concertos with string orchestra
ML - Books
ML1110-1270 History and criticism of orchestral music
MT - Musical instruction and study
MT125-130 Analytical guides to orchestral music
