I know the question has been asked on here several times "how many gallons of oil is equivalent to a cord of wood". I came across a pdf file on the Maine state website that compares different types of wood to other fuels.
http://www.maine.gov/doc/initiatives/wood_to_energy/documents/wood_vs_other_fuels.pdf
http://www.maine.gov/doc/initiatives/wood_to_energy/documents/wood_vs_other_fuels.pdf