National Audubon Society is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Associations Special Interest
• Environmental Conservation & Ecological Organizations

North American Industry Classification System (NAICS) Categories:

• Other Similar Organizations (Except Business, Professional, Labor, And Political Organizations)
• Administration Of Air And Water Resource And Solid Waste Management Programs > Environmental Organizations

Standard Industry Classification (SIC) Categories:

• Membership Organizations, Nec
• Air And Water Resource And Solid Waste Management > Environmental Organizations