"Roll On, Babe" was written by a folksinger named Derroll Adams, who was born in Oregon in 1925, went to Europe in the '60s and somehow wound up mentoring Donovan.

NPR: Vetiver: Shaggy Folk, Dug Out Of Amber

Serving under President Monroe, Adams was one of America's great Secretaries of State, arranging with England for the joint occupation of the Oregon country, obtaining from Spain the cession of the Floridas, and formulating with the President the Monroe Doctrine.

WHITEHOUSE: John Quincy Adams