2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14813We present preliminary polarisation VLBI maps of the gravitational lens system B0218+357, made at 3 different frequencies.2 pages Latex, 6 figures, uses psfig.sty; To appear in "Gravitational Lensing: Recent Progress and Future Goals", Boston University, July 1999, ed. T.G. Brainerd and C.S. KochanekAstrophysicstext