Die Plateaulehme Süd-Luxemburgs und ihre Bedeutung für die morphogenetische Interpretation der Landschaft / Theodorus Wilhelmus Maria LeveltMethoden van kleinonderzoek / Th.W.M. LeveltHet landschappelijk substraat / [door] Th. W. M. LeveltDie Plateaulehme Süd-Luxemburgs und ihre Bedeutung für die morphogenetische Interpretation der Landschaft / door Theodorus Wilhelmus Maria Levelt
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An inquiry into the probability of a polyclimatic development of peneplains and pediments (etchplains) in Europe during the senonian and teritary period / by J.P. Bakker and Th.W.M. Levelt $ The soils of Eastern Nigeria / P.D. JungeriusAn inquiry into probability of a polyclimatic development of peneplains and pediments (etchplains) in Europe during the Senonian and tertiary period / by J.P. Bakker and Th.W.M. Levelt ; The soils of Eastern Nigeria / P.D. Jungerius