Three-I League (Baseball league)

The Three-I League was a Class B minor league that operated in the Midwestern United States from 1901 through 1961. In the old classification system, a Class B minor league was the highest level of the "low minor leagues," typically Classes B, C, D and E. Officially named the Illinois-Iowa-Indiana League, the league quickly became known as the Three-I. It was one of the leading minor leagues in the Midwest and Mississippi River Valley for the first 60 years of the 20th century. Though the league stood for a span of 60 years, it witnessed four interruptions. Play was suspended for the 1918 season during World War I, 1933-1934 and 1936 during the Great Depression, and 1942-1945 during World War II. Though it disbanded after the 1961 season, the Three-I League remains one of the most significant low minor league operations in the history of the National Association of Professional Baseball Leagues.

From the description of [Three-I League organizational records : 1937-1962]. (National Baseball Hall of Fame). WorldCat record id: 39517534