Library of high and mid-resolution spectra in the Ca ii H & K, H∝, , Hβ, Na i D1, D2, and He i D3 line regions of F, G, K and M field starsD. Montes, E. L. Martín, M. J. Fernández-Figueroa, M. Cornide and E. De CastroAstron. Astrophys. Suppl. Ser., 123 3 (1997) 473-485DOI: https://doi.org/10.1051/aas:1997170