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Dear Ms. McNeal,
Thank you for posting your request on History Hub!
We suggest that you contact the Maryland Center for History and Culture for access to the McNeal-Watters-Preston-Munnikhuysen papers. We also suggest that you search the Race and Slavery Petitions Project , the United States, Indenture and Manumission Records, 1780-1939 and contact the Maryland State Archives for any manumission petitions mentioning the slave-holding families you listed.
We hope this is helpful. Best of luck with your research!
Thank you, Cara,
This is most helpful. Although I had actually sent some of the papers that are in the McNeal-Watters etc. archive to the Maryland Hist Society, I did not know that they were available online. This is a great boost. I will check out those other sources as well.