2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64303We classify all closed 1-connected manifolds $M$ which look like projective planes, i.e. with integral homology $H_*(M)=Z^3$. Furthermore, we give an explicit construction of these manifolds as Thom spaces of open disk bundles.to appear in: Journal of Differential GeometryGeometric TopologyDifferential Geometry57Nxx, 57R10, 55R60text