||The maps included in this publication have been designed to illustrate a number of the spatial changes that have occurred in South Asia's rice-wheat farming system over the past decades. The selection of maps presented is the result of map requests from various members of the Rice-Wheat research group and interest expressed by various IRRI, CIMMYT and NARS (National Agricultural Research Service of Bangladesh, India, Pakistan and Nepal) scientists. The maps do not offer equal coverage to all parts of the ricewheat region but concentrate heavily on the core area. None of the maps could have been done without the help of colleagues stationed in each of the four countries concerned. This includes both a wide range of NARS personnel and CIMMYT scientists. Throughout the effort, our own associates at IRRI were strongly supportive. All NARS, CIMMYT or IRRI scientists are invited to use these maps in their publications. Eighty-five percent of the time involved in this project has been spent in the development, justification and checking of the data bases. We have relied heavily on official agricultural and population census figures. A serious and omnipresent problem was that of adjusting historic data to that of the political boundaries as we have chosen to use them. In most, but not all, cases we have opted to use the boundaries as they existed in 1988 despite the fact that MANY districts had gone through two or even three boundary changes between 1960 and 1991. We acknowledge responsibility for errors and regret any inconvenience caused by such. On the other hand, we caution that what at first may appear to be an error often proves to be a reasonable estimate once the "ground truth" has been completed. The maps presented in this preliminary atlas are merely an indication of the range of analysis possible with the data bases we have assembled and using the Atlas*MapMaker software on any Macintosh computer from a Plus upward. Anyone wishing to use a map not included here has three options: 1. request a copy (free) of the data base from IRRI and compose the map her/him self; 2. ask the Director of GIS at IRRI to produce the map; or 3. write to: Dr and Mrs R.E.Huke, Department of Geography, Dartmouth College, Hanover, N.H. USA. These maps represent a preliminary output of the International Collaboration in Rice-Wheat Research for South Asia, under the leadership of Dr. T. Woodhead, IRRI.