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BOETTRICH. (1935). Bekämpfung des gewerblichen Staubes

Conferences

Milan 1906
Bruxelles 1910
Wien 1918
Amsterdam 1925
Budapest 1928
Geneve 1931
Bruxelles 1935
Frankfurt A.M. 1938
London 1948
Lisbona 1951
Napoli 1954
Helsinki 1957
New York 1960
Madrid 1963
Wien 1966
Tokyo 1969
Buenos Aires 1972
Brighton 1975
Dubrovnik 1978
Cairo 1981
Dublin 1984
Sydney 1987
Montreal 1990
Nice 1993
Stockholm 1996
Singapore 2000
Iguassu Falls – Brasil 2003
Milan 2006

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