• http://www.bcpl.lib.md.us/~tross/by/house.html

• BirdSource: Birdhouse Online
  http://birds.cornell.edu/birdhouse/

• Nest Structures, Feeders and Blinds North Dakota Game and Fish Department
  http://www.npwrc.usgs.gov/resource/tools/ndblinds/ndblinds.htm

Nest Box Drawings

• NABS Nestbox plans
  http://www.nabluebirdsociety.org/plans.htm

• The Purple Martin Conservation Association
  phone: 814/734-4420
  fax: 814/734-5803
  http://www.purplemartin.org/

Homes for Birds: Books

• Carrol Henderson, Woodworking for Wildlife, has plans for nestboxes for all types of cavity-nesters. It's available from the Nongame Wildlife Program, Minnesota Department of Natural Resources. For copies, contact: Minnesota's Bookstore, 117 University Ave., St. Paul, MN 55155. Phone 612/297-3000 or 800/657-3757.