Jerry Koosman's Mets number retirement is finally here
Jerry Koosman Autographed Jersey - Mets History
Jerry Koosman to Have Number Retired on August 28, 2021 - Metsmerized Online
New York Mets should consider these four players for jersey retirement
NY Mets All-Time Team: Tom Seaver and Jerry Koosman take the mound for Amazin' anniversary team – New York Daily News
Mets to retire Koosman's number — Queens Daily Eagle
Mets retiring Darryl Strawberry's No. 18, Dwight Gooden's No. 16 in 2024
Thrilled to be 'joining a great crew,' Jerry Koosman, 78, has jersey retired by New York Mets - ESPN
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns - CBS New York