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EC Tree
1.6.5.1 created 1961, deleted 1965
1.6.99.2 created 1961 as EC 1.6.5.2, transferred 1965 to EC 1.6.99.2, deleted 2005
1.6.99.4 created 1965, deleted 1972
1.6.99.7 created 1972, modified 1981 (EC 1.6.99.10 created 1978, incorporated 1981), deleted 2003
1.6.99.8 created 1972, deleted 2002
1.6.99.9 created 1972, deleted 2002
1.6.99.10 created 1978, deleted 1981
1.6.99.11 created 1989, deleted 2002
1.6.99.12 created 1989, deleted 2002
1.6.99.13 created 1992, deleted 2002