September 24, 1984: Cubs clinch first postseason berth since 1945 behind Sandberg, Matthews, Sutcliffe – Society for American Baseball Research

1984 National League Championship Series - Wikipedia

Grandfather of franchise' Keith Lieppman retires from A's after 52 years

TBT: 1984 Cubs clinch first crown in 39 years

Flashback: 1984 Cubs clinch first division title in 39 years

October 2, 1984: Cubs crush Padres in their first postseason game in 39 years – Society for American Baseball Research

Cubs VS Pirates Sept 24 1984 NL East Clincher

1984 NLCS Gm1: Cubs get first playoff win since 1945

⚾️On September 24, 1984 the Cubs clinch the National League East flag with a 4-2 victory over Pittsburgh at Three Rivers Stadium. Rick Suttcliffe's, By Davenport Sports Network

Who was the greatest Cubs second baseman?

Rick Sutcliffe, 1984 Cubs' ace, took on a Brave new world and had a grand old time - Chicago Sun-Times

This Day in Chicago Cubs History: Clinch Postseason Berth for the First Time Since World War II - Sports Illustrated Inside The Cubs