64 Parishes - Encyclopedia64 Parishes is a project of the Louisiana Endowment for the Humanities (LEH), a nonprofit that has partnered with communities, institutions, and individuals since 1971 to explore Louisiana’s past, reflect on its present, and imagine its future. LEH began publishing a quarterly magazine, Louisiana Cultural Vistas, in 1990. In 2008 LEH launched KnowLA, the online encyclopedia of Louisiana. 64 Parishes represents the evolution of this work, combining the encyclopedia and magazine under one title and continuing to produce engaging, well-researched information all about Louisiana.