Resources inventory of Botswana industrial rocks and minerals Massey, N. W. D. creator text bibliography bs Lobatse Geological Survey Dept. [1973] 1973 monographic eng
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 N. W. D. Massey. Cover title. Bibliography: p. 36-39. f-bs--- Nonmetallic minerals -- Botswana Nonmetallic minerals -- Botswana Building stones -- Botswana Building stones -- Botswana TN799.7.B55 M37 Mineral resources report (Lobatse) ; no. 3 79316467 791018 lce01140899