Walker helped advance the friendly Pima tribe Author R. G. Willson Article Date August 23, 1964 Journal Title Ariz Days & Ways
New light shed on Vekol silver mine; pt. 1 Author R. Willson Article Date February 28, 1965 Journal Title Ariz Days & Ways
New light shed on Vekol silver mine; conclusion Author R. Willson Article Date March 7, 1965 Journal Title Ariz Days & Ways