SIMBAD references

Our aim is to present an atlas containing 35 low-resolution spectra that correspond to 19 Type II supernovae. These spectra cover different phases of postmaximum supernova evolution, ranging from ∼2 weeks to ≳1 yr after maximum brightness. The Canarias Database of Nearby Type II Supernovae contains spectra obtained from two different programs: the first, the ``Supernova Monitoring Project'', was carried out from 1990 April to 1992 July; the second takes advantage of the ORM Service Time facility and is currently active. In this paper we present the first results, mainly compiled from the Supernova Monitoring Project.