To practice application - applying accent to a text specifically written for that accent or dialect - you'll need to explore the Library's plays collection. This page collects recommendations for browsing plays with accents and dialects and for streaming performances to help you practice!
If you're just looking for excerpts to practice with, check out the monologue collection below.
Looking for a play that features a specific dialect?
There are also free tools online that allow you to search for plays -- try a keyword search for your accent/dialect and see what comes up!