Below are downloadable legal forms that you will need for your home purchase or sale that are publically available.
Your jurisdiction will likely require additional forms; make sure you contact your local government or a Real Estate attorney to determine what is required and where you can obtain the necessary forms.
Lead Paint:
http://www.hud.gov/offices/lead/disclosurerule/index.cfm
Source: U.S. Dept. of Housing and Urban Development (HUD)
http://www.epa.gov/lead/pubs/leadbase.htm
Source: U.S. Environmental Protection Agency (EPA)
Radon:
http://www.epa.gov/radon/pubs/hmbyguid.html
Source: U.S. Environmental Protection Agency (EPA)