Ballin, Carl-Wilhelm
[Author];
Brandenburg, G.
[Author];
Felkel, Karl
[Author];
Hager, Martin
[Author];
Masson, B.
[Author];
Müller, E.
[Author];
Oebius, Horst
[Author];
Schäle, Erich
[Author];
Wetzel, Volkhard
[Author]
;
PIANC Deutschland
[Contributor]