TY - GEN AU - ben Mohamed, Abdelkrim TI - Turbidity and humidity parameters in Sahel: possible climatological implications KW - FENOMENOS OPTICOS NA ATMOSFERA KW - NIGERIA KW - 551.593.54 KW - med KW - fre KW - 551.510.42 KW - 551.58 KW - 551.571.3 (662.6) ER -