2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/169116We study the mixed Hodge structure on the third homology group of a threefold which is the double cover of projective three-space ramified over a quartic surface with a double conic. We deal with the Torelli problem for such threefolds.14 pages, presented at the Conference Arnol'd 70Algebraic Geometry14J30; 14C30text