More tremendous photos, stereoviews, and cartes de visite from Baltimore and Maryland can be found on Photographicus Baltimorensis:
This blog is a product of my preoccupation with Baltimore’s many early professional photographers and the thousands of portraits they took of Baltimoreans between the 1860s and the early 1920s, when Kodak’s advances made amateur photography a viable mass diversion.
It is nice when private collectors share their passion in a way that allows for broader public participation.
Historic Sprawl 
Have you ever come across any information about a Baltimore photographer named Harry M. Brown? I have recently purchased an imperial sized cabinet card (although 8×10 instead of the usual 7 x 10) of a member of the 5th Maryland Regiment of Infantry, Company K in a dress uniform that was worn between 1867 to about 1890. The photographer’s name in script, Harry M. Brown, Baltimore, is embossed on the bottom border of the backing card. I was hoping if I could find more information on the photographer, I might be able to better nail down the year the photo was taken, but I haven’t been able to find any information on the photographer..