Some examples of trade associations

It seems that there are many interests groups - trade associations - representing the businesses that use different building materials. 

We've been exploring these in class.

They don't all get along with each other.

Examples: 

- The California Straw Building Association.

- The Western States Clay Products Association.

- The American Iron and Steel Institute.

- The Stainless Steel Rebar Association.

- The Earthen Construction Initiative.

- The National Stone, Sand & Gravel Association.

- The Timber & Forestry Foundation.

- National Hardwood Lumber Association.