Archives of Maryland Online is a good source.
Check the Coleman directories,The First Colored Professional,Clerical and Business Directories Of Baltimore City.
Listed in the directories are the principals of the "Colored" Schools in
Baltimore and the names of the schools. This information maybe helpful. I
know there was a Colored High School located at Pennsylvania Ave. and Dolphin st. in Baltimore my Grandmother graduated from that approx. 1905. The school has since been torned down.