The website of the ACHP (http://www.achp.gov) contains substantial materials useful to Section 106 practitioners.  The site offers a wide range of useful documents ranging from the introductory Protecting Historic Properties: A Citizens’ Guide to Section 106 Review, to the full text of 36 C.F.R. Part 800.

The Secretary of Interior’s Standards and Guidelines can be found at  http://www.cr.nps.gov/local-law/arch_stnds_0.htm. 

The National Park Service publishes bulletins that provide guidance for applying the National Register eligibility criteria.  The bulletins are available at http://www.cr.nps.gov/nr/publications/bulletins.htm 

The National Conference of State Historic Preservation Officers (NCSHPO/THPO) web site provides contact information for SHPO/THPOs, at http://www.ncshpo.org. 

The National Association of Tribal Historic Preservation Officers (NATHPO) maintains a website with extensive information about tribal consultation procedures, at http://www.nathpo.org/.  These resources include a handbook with best practices for tribal consultation. 

The FHWA’s Environmental Guidebook (http://www.environment.fhwa.dot.gov) has a section on historic preservation issues.

The website of the AASHTO Center for Environmental Excellence, at http://environment.transportation.org, contains information on a number of environmental issues, including historic preservation.

The Transportation Research Board’s Committee on Historic and Archaeological Preservation in Transportation maintains a web site with information about upcoming conferences and ongoing TRB research efforts, which is available at http://www.itre.ncsu.edu/ADC50/index.htm. 

The ACHP’s Section 106 exemption for the Interstate System is available on the ACHP’s web site at: http://www.achp.gov/final_interstate_exemption_notice.pdf.  The FHWA’s list of Interstate System elements that are excluded from the exemption (and thus remain subject to Section 106) is available at: http://www.environment.fhwa.dot.gov/histpres/highways_list.asp.