We present preliminary results of line identification and equivalent width measurements in spectra of late M Dwarfs. We obtained 3.5 nights on Keck NASA time to collect high resolution (R 20,000) near-infrared (J-band) spectra using the NIRSPEC instrument on the Keck II telescope. Our sample consists of 40 nearby (distance < 20 pc) late M dwarfs (spectral type M5 - M9.5). Using VALD database we identified new atomic lines and verified them by comparing our results to those obtained through models of synthetic spectra. We obtained equivalent width of new and previously observed atomic lines. Our results of existing atomic lines compare well with those from Cushing et al. 2005. We observe a linearly increasing trend in equivalent widths of strong lines such as K I l while a decreasing trend is found in weakening lines like Na I.