The main site for MILES library is http://miles.iac.es. Please, go there for more information.
The MILES stellar library consist of ~1000 stars spanning a large range in atmospheric parameters. The spectra were obtained at the 2.5m INT telescope and cover the range 3525-7500Å at 2.50Å (FWHM) spectral resolution.
If you use this service in your research, please include the following acknowledgement in any resulting publications:
"Based on data from the MILES library service developed by the Spanish Virtual Observatory in the framework of the IAU Comission G5 Working Group : Spectral Stellar Libraries".