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Dorr John Van N.; Varencov Igor Mihajlovič; Grasselly Gyula: Letters of the Commission on Manganese (IAGOD). In: Acta mineralogica-petrographica, (20) 2. pp. 383-391. (1972)
Varencov Igor Mihajlovič; Grasselly Gyula: Letters of the Working Group on Manganese Formations of the International Association on the Genesis of Ore Deposits : report on the Statutory Meeting of the Working Group on Manganese Formation held on 31 August 1970 in Kyoto, during the IMA-IAGOD meetings '70. In: Acta mineralogica-petrographica, (19) 2. pp. 209-216. (1970)
Varencov Igor Mihajlovič; Grasselly Gyula: Letters of the Working Group on Manganese Formations of the International Association on the Genesis of Ore Deposits : provisional programme of the Working Group on Manganese Formations sponsored by the International Association on the Genesis of Ore Deposits (IAGOD). In: Acta mineralogica-petrographica, (19) 1. pp. 101-104. (1969)
