7th Congress of the International commission on irrigation and drainage held in Mexico 1969. - ill. - Met lit. opg. - Bevat o.a. W.M. Otto, Reclamation and development of a drained area in the Netherlands. - 11 p. - Met een samenvatting in het Frans; F.C. Zuidema and J. Scholten, Maintenance of tile drainage systems. ...
Otto, W.M. (Willem Maria)
Scholten, J.
Zuidema, F.C.