Remember to seek out local sources that might have information on your topic. For example, a park or recreational area web site or ranger office, the local public library's files on area features, a nearby natural history museum... be creative in thinking of possible resources.
Greensboro Public Library's Guide to Using Records
Locating North Carolina Special Collections - NC-ECHO (Exploring Cultural Heritage Online)
Finding other special collections - Repositories of Primary Resources
ArchiveGrid via NCLive (see also Databases by Subject - History)
ArchiveGrid is an important destination for searching for historical documents, personal papers and family histories held in archives throughout the world. ArchiveGrid is an online service that provides access to detailed archival collection descriptions. It includes nearly a million descriptions of archival collections held by thousands of libraries, museums, historical societies and archives worldwide.