Jimmy Newman is by Tom Paxton. It is on several of his recordings: "#6", "The Compleat Tom Paxton", "The Very Best of Tom Paxton", and "The Best of Tom Paxton". The latter 2 are CD's
There is also a recording of the song by Fred Holstein on an album called "Gathering At The Early Of Old Town", originally an LP on the Mountain Railroad label and recently reissued on CD.
It is also on John Denver's "Take Me To Tomorrow " album