WTA Nederland-Vlaanderen financially supported the project to make Dutch catalogues with building materials (Catalogus voor de Bouwwereld) from the 20th century available to the WTA-community and beyond. The catalogues are important sources of information to identify building materials and building products in historic buildings in order to decide on their preservation, repair or replacement.
Through this project the catalogues of the years 1935, 1937, 1948, 1950, 1957, 1960, 1966 en 1975 were scanned and made available online.