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2. Anon. 1963. “Reconstruction of the Heinrich Rau Potash Combine”, Phos. & Potas., No. 35, pp. 40–42 (May/June).
3. Anon. 1968. “The Soligorsk No. 1 Potash Combine”, Phos. & Potas., No. 33, pp. 38–40 (Jan/Feb).
4. Anon. 1969a. “Flotation Studies at the USSR Stebnik Deposit”, Phos. & Potas., No. 44, pp. 51–52.
5. Anon. 1969b. “Noranda Mines’ Colonsay-Viscount (Central Canada Potash) Potash Project”, Phos, and Potas., No. 43, pp. 46–48 (Sept./Oct.).