1. HOMOGENEOUS ABSORPTION CROSS SECTION OF LEAD-BISMUTHATE GLASSES. Authors: R. POP, N.N. PUŞCAŞ, VIORICA SIMON.2. HYDRIC CHARACTERISTICS OF HUEDIN DEPRESSION. Authors: R. POP, V. SOROCOVSCHI.3. THE ANALYSIS OF HYDROLOGICAL DROUGHT IN TRANSYLVANIAN PLAIN DURING 1980-1997. Authors: R. POP, T. MAN.4. MAGNETIC BEHAVIOUR OF OXIDE LEAD-BISMUTHATE GLASSES CONTAINING IRON IONS. Authors: R. POP, VIORICA SIMON, I. COSMA, M. COLDEA.5. ASPECTS REGARDING THE WATER SUPPLAY OF THE TOWNS SITUATED IN CLUJ COUNTY. Authors: R. POP, V. SOROCOVSCHI.