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Dear Ms. Voris,
Thank you for posting your request on History Hub!
We suggest that you begin by reviewing the Maryland State Archives website on Birth Records. They can provide birth records from the mid 1800s to 1924 depending upon the location of the birth in Maryland.
We also searched Ancestry and located 20 hits for a William Morris born about 1826 in Maryland/Pennsylvania/West Virginia/DC. We were unable to locate birth records for a Mary E. Stevens. There are two public family trees that indicate that Mary was born in California.
There may be a fee for access to these records on Ancestry. Or you may view these records online at one NARA's facilities for free via ALIC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/. Also, some of the images from Ancestry are available for free on Family Search at https://www.familysearch.org/en/.
We hope this information is helpful. Best of luck with your research!