1. Thoughts on the evolution of hydrogeologic practice in the USA during the last 40 years

   • E. Weeks

   Editor's Message Pages: 519 - 521

2. Groundwater recharge and chemical evolution in the southern High Plains of Texas, USA

   • Alan E. Fryar
   • William F. Mullican
   • Stephen A. Macko

   Paper Pages: 522 - 542

3. Evaluation of probabilistic flow in two unsaturated soils

   • Samuel Boateng

   Pages: 543 - 554

4. GIS-based hydrogeological databases and groundwater modelling

   • Radu Gogu
   • Guy Carabin
   • Alain Dassargues

   Paper Pages: 555 - 569

5. Correlation of hydraulic conductivity with stratigraphy in a fractured-dolomite aquifer, northeastern Wisconsin, USA

   • M. Muldoon
   • J. (Toni) Simo
   • K. Bradbury

   Report Pages: 570 - 583

6. A geochemical and geophysical approach to derive a conceptual circulation model of CO₂-rich mineral waters: A case study of Vilarelho da Raia, northern Portugal

   • J. Marques
   • Monteiro F. Santos
   • L. Mendes Victor

   Report Pages: 584 - 596

7. Geochemistry of groundwater in the alluvial plain of Tucumán province, Argentina

   • Gabriela M. García
   • Margarita del V. Hidalgo
   • Miguel A. Blesa

   Report Pages: 597 - 610

8. Groundwater contamination in the basement-complex area of Ile-Ife, southwestern Nigeria: A case study using the electrical-resistivity geophysical method

   • A. Adepelumi
   • B. Ako
   • T. Ajayi

   Report Pages: 611 - 622

9. Discussion of "Hydrochemical and isotopic properties of the Mahmutlu and Bağdatoğlu mineralized thermal springs, Kırşehir, Turkey" (Ünsal and Afşin 1999)

   • Tolga Yalçin

   Discussion Pages: 623 - 623