http://www.tourismcenter.msu.edu/
Travel, Tourism, and Recreation Resource Site at Michigan State University  

http://www.msue.msu.edu/portal/default.cfm?pageset_id=117281
Michigan State University Extension - tourism area of expertise

http://www.michigan.gov/agtourism
Michigan's second and third largest industries are tourism and agriculture. It is only natural for them to join forces to help create a stronger economy and a more enjoyable stay here in Michigan.

http://www.michigan.gov/agtourism/0,1607,7-220--161571--,00.html
The Michigan Agricultural Tourism Advisory Commission, established in June 2005, by P.A. 46 of 2005, has issued its final report of recommendations to the Governor and Michigan Legislature.

Travel Industry Association of America *
http://www.tia.org/index.html
To represent the whole of the U.S. travel industry and to promote and facilitate increased travel to and within the United States          

United Nations World Tourism Organization (UNWTO) *     
http://www.unwto.org/aboutwto/index.php    

            The World Tourism Organization (UNWTO/OMT) is a specialized agency of the United ‎ Nations and the leading international organization in the field of tourism.

            Why Tourism?  Over the decades, tourism has experienced continued growth and deepening ‎ diversification to become one of the fastest growing economic sectors in the world. ‎ Modern tourism is closely linked to development and encompasses a growing number ‎ of new destinations. These dynamics have turned tourism into a key driver for socio- ‎ economic progress. ‎

           The United Nations World Tourism Organization (UNWTO), headquartered in Madrid , Spain, is a United Nations agency dealing with questions relating to tourism . It compiles the World Tourism Rankings ^[1] .

            ·    ^ UNWTO World Tourism Barometer

The UNWTO World Tourism Barometer is a regular publication of the Market Intelligence and Promotion Department of UNWTO aimed at monitoring the short-term evolution of tourism and providing the sector with relevant and timely information.

Research groups - web-sites   Association of Tourism and Leisure Education (ATLAS)* http://www.atlas-euro.org/

Adventure Travel Trade Association *
http://www.adventuretravel.biz/

       The Adventure Travel Trade Association exists to:

• Promote and grow the adventure travel market
• Provide professional support, development, marketing, and cost-saving resources to members
• Represent and unify the industry to facilitate knowledge sharing and a common vision
• Collect, interpret and share exclusive trade and consumer research and trends

PowerofTravel.org
An interactive website with facts and figures on the economic impact of travel. *

DiscoverAmerica.com
The first-ever official U.S. travel and tourism website. *

*Source:  http://en.wikipedia.org/wiki/Tourism