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An atlas of high resolution (R = 60 000) CCD-spectra in the wavelength range 3500-5000(A) is presented for four objects in metallicity range -3.0 ＜ [Fe/H] ＜ -0.6,temperature range 4750 ＜ Teff ＜ 5900K, and surface gravity range 1.6 ＜ lgg ＜ 5.0.We describe the calibration of the stellar atmospheric parameters using Alonsos formula based on the method of infrared flux and outline the determination of the abundances of a total number of 25 chemical elements. An analysis of the abundance determination errors for different chemical elements is carried out, and a method is provided for the observations and reduction of spectral material. Properties of the method of producing an atlas of spectra and line identifications are described.