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Dorr John Van N.: Letters of the Working Group on Manganese Formation of International Association on the Genesis of Ore Deposits : memorial of Donnel Foster Hewett. In: Acta mineralogica-petrographica, (20) 1. pp. 177-178. (1971)
Dorr John Van N.: Letters of the Working Group on Manganese Formations of the International Association on the Genesis of Ore Deposits : report on international symposium on the geology and genesis of Precambrian iron and manganese formations, Kiev, August, 19-25, 1970. In: Acta mineralogica-petrographica, (19) 2. pp. 221-226. (1970)
