Thoughts on the evolution of hydrogeologic practice in the USA during the last 40 years E. Weeks Editor's Message Pages: 519 - 521
Groundwater recharge and chemical evolution in the southern High Plains of Texas, USA Alan E. FryarWilliam F. MullicanStephen A. Macko Paper Pages: 522 - 542
GIS-based hydrogeological databases and groundwater modelling Radu GoguGuy CarabinAlain Dassargues Paper Pages: 555 - 569
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
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. MarquesMonteiro F. Santos L. Mendes Victor Report Pages: 584 - 596
Geochemistry of groundwater in the alluvial plain of Tucumán province, Argentina Gabriela M. GarcíaMargarita del V. HidalgoMiguel A. Blesa Report Pages: 597 - 610
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
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