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1by Verhoef, P.
Published 1966[Amsterdam : s.n., 1966]531, [14] p. : ill., maps (some fold. in pocket) ; 27 cm.Subjects: “...Soil science....”
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2by Broek, Theo Maria Wilhelmus van den
Published 1989[Amsterdam] : Fysisch Geografisch en Bodemkundig Laboratorium, Faculteit Ruimtelijke Wetenschappen, Universiteit van Amsterdam, c1989.[xi], 109, [20] p. : ill. ; 24 cm.Subjects: “...Soil science Luxembourg....”