The following links can be used to find more information about hard mast.

State Agencies 

Connecticut Wildlife Division
http://dep.state.ct.us/burnatr/wildlife/wdhome.htm
 
Maryland Department of Natural Resources
http://www.dnr.state.md.us/sw_index_flash.asp 
 
Ohio Department of Natural Resources
http://www.ohiodnr.com/
http://www.dnr.state.oh.us/wildlife/resources/wildnotes/pub068.htm
 
Pennsylvania Game Commission
http://www.pgc.state.pa.us/
 
Rhode Island Division of Fish and Wildlife
http://www.dem.ri.gov/programs/bnatres/fishwild/
 
Virginia Department of Game and Inland Fisheries
http://www.dgif.virginia.gov/ 
 
West Virginia Division of Natural Resources
http://www.wvdnr.gov/ 
 

Federal Agencies

The National Biological Information Infrastructure
http://www.nbii.org/index.html

U.S.D.A. Forest Service: Forest Inventory and Analysis Program
http://www.fia.fs.fed.us/
 
 

Miscellaneous
 
The Conservation Management Institute
http://www.cmiweb.org/
 
The Cooperative Eastern Oak Initiative
http://www.cmiweb.org/ceoi/