USGS Location & Mapping.
Clicking on this link allows you to create a list of links of geographical "features" in Crawford Co. From
this list, you can then generate a map showing the location of a particular feature.
Ancestry.com -- contains a number of genealogical databases, as
well as the images of every Federal US census. Some are free, others are "pay per view".
FamilySearch.org -- LDS genealogical web site. Contains
the only searchable everyname index to the US 1880 Census.
Heritage Quest -- contains a number of genealogical books
that are searchable, as well as a number of census records. Contains the only search engine for the US 1900 census.
("pay-per-view" site).