2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14807The use of molecular absorption lines in deriving the timde delay in PKS1830-211 is described, as well as results from a three year monitoring campaign. The time delay and the implied value for the Hubble constant are presented.2 pages, Poster contribution to "Gravitational Lensing: Recent Progress and Future Goals", Boston University July 1999, eds. T.G. Brainerd and C.S. KochanekAstrophysicstext