a, Spraying operations were directed at specific targets, 487 of which are shown. Labels in a refer to areas blown up in the corresponding parts of Figs 1 and 2. b, Some areas were targeted in multiple projects at different times: black box, 1964; red boxes, 1965; green boxes, 1966. c, We identified targets active before 1965; at least 4.7 million litres of herbicides were used to destroy 33,339 ha of crops and defoliate 101,300 ha of land. Dioxin contamination may be particularly relevant for this time period. d, Correspondence between HERBS file Agents Orange and White mission paths (orange and white lines) and target boxes, three of which enclose a railroad right-of-way. In Figs 1 and 2, waterways such as canals and rivers are shown in blue.
