A little google has told me it's The Dillards who do "Pretty Polly" on that set.
EKL 9001 - The Folk Box - Various Artists [1964] (4-LPs) Issued in mono only. A boxed set of 4 discs with a 48 page booklet , put together by Robert Shelton with the assistance of Folkways Records. This box was issued in the UK as EUK 2512/2.
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sj