Land Ownership Maps
These maps of counties and towns from the mid-nineteenth to early twentieth-century show who actually owned property. Now available online through Ancestry.
Deeds, Patents, and Land Records
Almost every country, region, state/province, county/city anywhere in the world has a genealogical organization. Through an association or society, you might find resources and information about resources based on a locality, local history/genealogy projects and databases, professional certified genealogists for hire who can do research in local archives and libraries, transcribe and translate, obtain copies of archival documents, and more.
Ethnicities have associations and societies as well and can offer training, resources, as well as access to professional certified genealogists for hire.