Forest Products Laboratory.
Wood Handbook: Wood as an Engineering Material.
Technical Report FPL-GTR-113.
Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1999.

Downloadable from www.fpl.fs.fed.us/documnts/fplgtr/fplgtr113/fplgtr113.pdf

Harry A. Alden
Hardwoods of North America.
General Technical Report FPL-GTR-83.
Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1995.

Downloadable from www.fpl.fs.fed.us/publications/fplgtr83.pdf

Harry A. Alden
Softwoods of North America.
General Technical Report FPL-GTR-102.
Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1997.

Downloadable from www.fpl.fs.fed.us/publications/fplgtr102.pdf

Martin Chudnoff.
Tropical Timbers of the World.
Agriculture Handbook 607.
Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1979.

Downloadable from www.fpl.fs.fed.us/publications/chud_total.pdf

David W. Green, Marshall Begel and William Nelson.
Janka Hardness Using Nonstandard Specimens.
Research Note FPL-RN-0303.
Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2006.

Downloadable from www.fpl.fs.fed.us/documnts/fplrn/fpl_rn303.pdf