The Museum of the City of New York is pleased to announce that over 400 scripts, scores, and sheet music by George M. Cohan (1878-1942) are now freely available online through the Museum’s Collections Portal. View the Collection
If you are looking for scripts for MUSICALS, these are shelved together at ML 50 on level four. (They are filed by COMPOSER even though they are scripts, which is perhaps unexpected.)
Most monologues are located in the "Monologues" shelf, in the Humanities Reference shelves on level 5: classic monologues for men, women, children, young adults, monologues from film scenes, shakespeare and classical audition speeches.. For specific location, ask at the Humanities Help Desk. For additional sources, check also in the regular stacks, under the same call numbers.
You can also search the library's catalog using any of the following subject headings: monologues, dramatic monologues, monodramas, humorous poetry english, humorous recitations, dialogues acting--auditions, one-act plays, american.