Image of 3 pencils that Clara Schumann used are among the 3D objects in the New York Public Library for the Performing Arts collection.
Kathy's process with Ethel Smyth:
1. Grove Music
2.OBIS searching - subject and author
3.. Google Books - jumping back to OBIS
4. CD notes in NAXOS
5. Searching on the web: New York Philharmonic Archives, IMSLP, British Library
Emilie Mayer, Louise Farrenc, Clara Schumann, Maria Agata Szymanowska, Fanny Hensel, Clara Schumann, Pauline Viarot-Garcia, Amy Beach, Teresa Carreño, Cécile Chaminade, Mél Bonis, Josephine Lang, Margaret Ruthven Lang, Julie von Webenau, Elfrida Andrée, Agathe Backer Grøndahl, Amanda Röntgen-Maier, Luise Adolpha Le Beau.
Briscoe, James R, ed. New Historical Anthology of Music by Women (2004). M1 .H664 2004
Scores and accompanying essays about the composers, including (from the Romantic era): Maria Agata Szymanowska, Fanny Mendelssohn Hensel, Clara Schumann, Louise Farrenc, Pauline Viarot-Garcia, Amy Beach, Teresa Carreño, Cecile Chaminade
Hinson, Maurice, ed. At the Piano with Women Composers (1995) M21 .A84 1995
Scores of piano music by many 19th c. composers (also some earlier ones...double check the composer’s dates).
Extensive anthology of scores by women composers, with biographical notes. These three volumes are all for composers born 1800-99.
Bowers, Jane and Judith Tick. Women Making Music: The Western Art Tradition, 1150-1950 (1986). ML82 .W67 1986
Glickman, Sylvia, and Martha Furman Schleifer, eds. From Convent to Concert Hall: A Guide to Women Composers (2003). ML82 .F76 2003
McVicker, Mary F. Women Composers of Classical Music: 369 Biographies From 1550 into the 20th Century (2011). ML390 .M4647 2011
Analysis of music:
Kenny, Aisling, and Susan Wollenberg, eds. Women and the Nineteenth-Century Lied (2015). ML1605 .W66 2015
Essays focusing specifically on the art song genre.
Parsons, Laurel, and Brenda Ravenscroft, eds. Analytical Essays on Music by Women Composers: Secular & Sacred Music to 1900 (2018) E-book
Analytical essays on music by Fanny Hensel, Josephie Lang, Clara Schumann, and Amy Beach.
Rob Deemer’s Composer Diversity Database is a powerful, fully-searchable database that will allow you to find music for any type of ensemble by women (and composers of color).