We present a new study of double c\bar {c} production in the e⁺ e^- continuum: many double charmonium final states are observed for the first time; the e⁺ e^- \to J/\psi c\bar {c} cross-section is measured with reduced model dependence.

PACS numbers: 14.40.Gx, 12.38.Bx, 13.66.Bc, 12.39.Hg