I hope that this is new information to those reseaching in MD.
I just retraced my steps after about 3 months and though that I would check the Maryland State Archives.
Surprise;; they have a new online search of Death Certificates that you can get within 10 days! You can scroll through by ABC and I was thrilled to find my g g grand father,,,
There was the image: Stephen Manns
Died: June 10, 1810
C (colored) Age: 65 years
It is so well done! You just click on the image and fill out a form ,print out the form and Mail it in $12 plain copy and $25 for a full certificate.
Takes ten days from the time you order.
I found a few other Manns names but I'm going to try this one first.