Ground-water contamination : field methods : a symposium / Collins, A. Gene. Johnson, A. I. American Society for Testing and Materials. ASTM Committee D-18 on Soil and Rock. Groundwater Groundwater 628 AST 1988 A105 Or. "Papers ... presented at the Symposium on Field Methods for Ground-Water Contamination Studies and Their Standardization"--Foreword. "ASTM publication code number (PCN) 04-963000-38." Philadelphia, PA : ASTM, c1988. c1988. Text ix, 491 p. :