Peter, Paul and Mary is the eponymous debut album, released in 1962 by the American folk-singing trio Peter, Paul and Mary. Featuring some of their most iconic songs such as "If I Had a Hammer" and "Lemon Tree".
Kalligraphia is the likely font used on the cover, designed by Otto Weisert in 1902 as a cursive art nouveau display script typeface with a unique stroke contrast model. As a commercial font, it can be viewed and purchased here.