Internal evidence (the correspondent's letter's own 'March of 1966' and 'last September' references, corroborated by the lecture's confirmed chrome dateline 1966-11-15) places Neville's March-departure/fall-return Barbados plan in 1966, not 1967 as the title states. The title's 1967 appears to derive from the now-superseded delivery claim d0 (bound/possible, called an unsupported extrapolation by the packet's own d1 analysis).