| http://www.w3.org/ns/prov#value | - (AP) Fifty years after American planes first sprayed Vietnam's thick jungles with Agent Orange to destroy enemy cover, the United States began for the first time cleaning up dioxin left from the chemical defoliant.A groundbreaking ceremony was held Thursday at a former U.S. air base in Danang.Dioxin, a chemical linked to cancer, birth defects and other disabilities, has seeped into Vietnam's soils
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