Paul Otlet was a Belgian, *1868, died 1944, who perfected the Dewey Classification system as "the Universal Decimal Classification", in his lifetime alone totalling 17 million index cards of human knowledge.
1986
1994
2016
2021
1909
2003
1897
2018
1999
1987
2013
1913
2008
2020
1966
2005
2023