Soil and planningSoil mapping : a quarter century of research with drill and spadeStreekplan Zuid-Limburg : the soilBelgium : international exhibition, Amsterdam 1950 = Belgique : exposition internationale, Amsterdam 1950 = Belgium : international exhibition, Amsterdam 1950 / International Federation for Housing and Town PlanningSiedlungsgelände von MarkeMan and soil in the delta : field trip April 26, 1968Belgium = Belgique = Belgium : international exhibition = exposition internationale = international exhibition : [Exhibition catalogue : XXth International Congress for Housing and Town planning]Markerwaard : atlas of soil conditions and soil suitabilityA soil mapping for the purpose of urban planning