In 1971, there were at least 49 Interest groups in Minnesota with major water and related land resources programs, at least 80 organizations that tend to have a continuing interest in water and related land resources issues, and at least 150 National organizations concerned with water and related land resources programs which have or could have members in the State. Of the 53 Interest groups (49 Interest groups and 4 Leagues and Associations mentioned above), 40 were conservation-preservation oriented, 8 had the word environmental in their name, and 5 were development and management oriented. Taking into consideration multiple memberships, it is estimated that approximately 25,000 citizens in Minnesota were members of the 53 Interest groups in 1971. Membership in individual Interest groups ranged from 13 to 12,000. Expenditures in 1971 for water and related land resources programs of the 53 Interest groups probably totaled in excess of $250,000. It is estimated that the number of water and related land resources Interest groups increased from about 16 in 1950 to 25 in 1960 to 33 in 1965 to 53 in 1971. (Author)