1
Date 1983
Subjects: ';
“...congressen...”
monografie
2
Date 1972
Subjects: ';
“...JS-congressen...”
brochure
3
Date 1957
Subjects: ';
“...congressen...”
brochure
4
5
Subjects: ';
“...congressen...”
brochure
6
Speciaal nummer van "Informatie en Argumentatie" By Jacquemin, Nico, De Loose, Paul, Hanus, Georges
Date 1978
Subjects: ';
“...congressen...”Date 1978
monografie
7
Date 1977
Subjects: ';
“...BSP-congressen...”
monografie