2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219985We develop recursive formulas for the horizontal and vertical monodromies of a quasi-ordinary surface. These are monodromies associated to the Milnor fiber of a slice transverse to a component of the singular locus. In the course of working out these recursions, we have discovered what appears to be a new way to express the monodromy associated to the Milnor fibration of a singular plane curve.19 pages, 5 figuresAlgebraic Geometry14B05text