6 I refer you again to an invaluable resource, NTPA: National Trade and Professional Associations of the United States (New York: Columbia Books, Inc.). See the Web site for specific contact information. This annual publication contains every trade association, its president, budget, convention sites, conference themes, membership, and other pertinent information, and no speaker’s reference library should be without it (https://www.columbiabooks.com).
,18.223.20.57