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1932 – 1981
The Shamrocks' affiliations are the skeleton of their course. The conference record, carried in the schools file at snippet strength and in the conference tables, runs the school from the St. Joseph County Conference — reorganised as the Northern Indiana Valley Conference in 1932 — through 1966, and then in the Northern State Conference from 1966 until 1981, when the line ends "none (consolidated into Glenn)." Inside that frame the reached record gives seasons at newspaper strength. The fullest single season is 1960–61: the John Adams High School Tower of 17 February 1961, previewing the Mishawaka sectional, reported Joe Hamilton's North Liberty Shamrocks owning the sectional's best record at 19–1, their only loss to Union Township, with wins over Riley, Washington and Penn behind them. A rival school's yearbook tells the county tournament of the same era from the other bench: Madison Township's 1960 Madisonian records North Liberty overpowering Madison 86–57 in the county tourney, then beating Madison again, 59–49, in the sectional. The school's complete season-by-season course, 1920-21 through 1980-81, exists in one named carrier — E. T. Pearl's Shamrock chronicle, cited in the sports-players file — and its reading is the team-histories leg's named settler, not a gap this survey papers over.