2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74981We present a practical algorithm to determine the minimal genus of non-orientable spanning surfaces for 2-bridge knots, called the crosscap numbers. We will exhibit a table of crosscap numbers of 2-bridge knots up to 12crossings (all 362 of them).17 pages, 7 figuresGeometric Topology57M25text