Start with a simple search. Use quotation marks to indicate that an entire phrase must be present.
"martha berry"
"berry college"
"berry schools"
Most resources provide an advanced search to narrow by type of material or subject. Key subjects inlcude:
history
philanthropy
For broader materials which will provide context (and may or may not mention Berry) keywords include:
rural schools
educators
education -- southern states
appalachians -- georgia
Try these keyword searches to find material in the general collection as well as some archival materials: