[Study trip by a Belgian mission to Poland].
D000047:Academies and Institutes / Q000458:organization & administration; D003032:Coal Mining; D003201:Computers; D004391:Dust / Q000517:prevention & control; D005740:Gases / Q000032:analysis; D011044:Poland; D012449:Safety; D014691:Ventilation
D004391:Dust; D005740:Gases
Studiereis van een Belgische missie in Polen.