4/1/98 Accompanying report and documentation: AIR2D - A computer code to simulate two-dimensional, radially symmetric airflow in the unsaturated zone, U.S. Geological Survey Open-File Report 97-588, 106 p. by Craig J. Joss and Arthur L. Baehr It is assumed that users have access to a Fortran compiler. For questions or copies of the documentation contact: Arthur L. Baehr U.S. Geological Survey 810 Bear Tavern Road West Trenton, New Jersey 08628 609-771-3978 abaehr@usgs.gov