I was surfing the webs when I came upon a map service that displayed the former and current site of Dunbar Senior High School. To be more precise, these would be the second and third sites for the Dunbar School as I recall is was located on a different block originally. I have found several interesting services that provide mappable data of the District. Hopefully, the link to this jpeg works.
In black ink, you can see the former building which would be near the east end zone of the field. While the current building is in purple on the west end of the property.
Bates Area Civic Association 
try looking up “Baist maps” that’ll give you plat maps from @1900-1950. many are online.