
Source: www.hursthardwoods.com
7 1/2" x 5/8" European French Oak Unfinished (SQUARE EDGE) Hardwood Flooring.

Source: www.reservehardwoodflooring.com
1 1/2" x 3/4" Red Oak #2 Common Unfinished Solid Wood Floors Priced Cheap at Reserve Hardwood Flooring | Reserve Hardwood Flooring.

Source: hardwoodfloordepot.com
Walnut #2 Common Grade Unfinished Solid Hardwood Flooring | Hardwood Floor Depot.
How to install (nail down) unfinished hardwood floors
We installed this red oak unfinished hardwood floor in Ellenwood, Ga, in June 2012. The wood is a 3/4 inch thick and 3 1/4 inches wide. After the sub-floor is prepared and the felt paper is laid down you need to nail/staple the hardwood to the sub-floor. The next step would be refinishing the unfinished hardwood floor. Finish the project with needed transitions and shoe molding along the baseboard.
Please visit www.atlfloors.com for pictures of wood flooring, ideas or to get a free quote for your hardwood project.
Walnut #2 Common Grade Unfinished Solid Hardwood Flooring | Hardwood Floor Depot

Source: buildingadvisor.com
Prefinished Hardwood Flooring vs. Unfinished? - Building Advisor.

Source: www.reservehardwoodflooring.com
6" x 3/4" Hickory #3 Common Unfinished Solid Wood Floors Priced Cheap at Reserve Hardwood Flooring | Reserve Hardwood Flooring.

Source: seacoastfloor.com
Unfinished Wood Flooring - Seacoast Floor Supply.