2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/1405We summarize here some of the main results we have reached so far in the ASCA Hard Serendipitous Survey, a survey program conducted in the 2-10 keV energy band. In particular we will discuss the number-flux relationship, the 2-10 keV spectral properties of the sources, and the cross-correlation of the ASCA sources with ROSAT sources.4 pages, LaTex manuscript. Proceedings of the Conference SAIt 2000, XLIV Congresso Nazionale, Monte Porzio Catone (Rome, Italy) 10-15 April 2000. To be published in Mem. Soc. Astr. ItAstrophysicstext