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Dear Ms. Richardson,
Thank you for posting your request on History Hub!
Records in the custody of the National Archives pertaining to Native Americans is available at https://www.archives.gov/research/native-americans. Tribal census and other records are limited to those individuals that were associated with a tribe either in the southeastern or mid-western sections of the United States.
Maryland Native American tribes either left the area or were decimated early in the colonial era after years of skirmishings. Similar results happened to tribes in Pennsylvania by about the mid-1700’s. For more information about this period and/or about possible remaining Native Americans, please contact the Pennsylvania State Archives and the Maryland State Archives.
We hope this is helpful. Best of luck with your family research!