The Southwest Ohio Amusement Park Historical Society operates from the Springdale Community Center & Library in Springdale, Ohio—not Liberty Township. The society preserves artifacts, photographs, and oral histories of defunct parks like LeSourdsville Lake (Americana Amusement Park), Coney Island (Cincinnati), and Chester Park.
Open by appointment through Springdale Community Center (9350 Winton Rd, Springdale, OH 45246). Digital archive accessible via website (soaphs.org). Volunteer-driven; donations of artifacts/memories welcomed.
Liberty Township (Butler County) has no amusement park historical society—though it's near the former LeSourdsville Lake site (Monroe), which may explain the confusion.