Open Access Research Paper Views (370) Download (12) Index of drought and wet years using the percentage of normal (PNPI) and Nietzsche Semnan Sahar Ghafari, Rahim Rezaie, Esfandiar Jahantab J. Bio. Env. Sci.4( 6), 124-130, June 2014. Key: DroughtNietzsche and SemnanPercent of Normal Precipitation Index (PNPI)Wet Details
