2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11047The success of the Hubble Deep Field (HDF) data in identifying galaxies at redshifts up to ~3 has been quite spectacular. It is possible to extend this to even higher redshifts using infrared techniques, several of which are briefly described in this paper.3 pages, LaTeX, no figures, uses World Scientific Press style file. To appear in the proceedings from the 18th Texas Symposium (1996)Astrophysicstext