This spectral atlas is based on low-resolution spectra from the LAMOST telescope in China and put together by Stefan Hümmerich. It covers the chemically peculiar stars of the upper main sequence, including the Am, Ap, HgMn, He-peculiar and λ Bootis stars. Stefan shortly discusses their spectral peculiarities and the more common pitfalls encountered in the classification of these objects.
The atlas may be accessed via MKCLASS website by Richard O Gray:
http://www.appstate.edu/~grayro/mkclass/
http://www.appstate.edu/~grayro/mkclass/LAMOST_CP_Atlas_v1.pdf