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user's manual for a method of map scanning and digital editing for thematic map production and data-base construction / D.R.Soller,W.R.Stettner,K.J.Lanfear,D.S.Aitken, 1990. - IV,38 p. p. - Текст : непосредственный.
Societal value of geologic maps / R.L.Bernknopf,D.S.Brookshire,D.R.Soller и др., 1993. - VI,53 p. p. - Текст : непосредственный.