Connie,
Do his materials relate to a specific location or region i.e : Silver Spring, Maryland or Montgomery County, Maryland. What about a specific ethnic/cultural/religious group (asian-american, norwegian-american, african-american, Jewish, Lutheran, etc.) etc. In my area, both the County Historical society and State Historical Society will often accept these types of records, especially if most of them pertain to the region or feature a prominent local family.
In terms of an ethnic/cultural/religious group there are places like the Finnish American Heritage Center Archive and Museum in Michigan and the Irish American Heritage Center in Chicago.
