2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147224We investigate the moduli theory of Calabi--Yau threefolds, and using Griffiths' work on the period map, we derive some finiteness results. In particular, we confirm a prediction of Morrison's Cone Conjecture.15 pages LaTex, uses amstex, amscd. New title, paper completely rewritten, results same as in previous versionsAlgebraic Geometry14J32, 14D07text