Hfonc.e00 (helminthiasis filariid onchocerca volvulus) is an ARC/INFO interchange file. The file can only be used with Geographic Information System (GIS) software, such as ARC/INFO, the file's native format, or by importing it into another GIS software package.

Hfonc.e00 was digitized from a paper map. The source of which is: "Distribution of Helminthiases: Atlas of Diseases – Plate 4." The American Geographical Society. The Geographical Review, Vol. 42, No. 1, 1952.

This GIS data was created as part of The Center for International Development’s ongoing research into the role of geography in economic development (see www.cid.harvard.edu/economic.htm). It was created between 1998 and 1999. Please reference CID if you use this data in a publication.