Atmospheric dispersion modeling programs such as the Climatological Dispersion Model (CDM), Air Quality Display Model (ACDM), and Implementation Planning Program (IPP) are among the most basic tools used for evaluation of air quality and State Implementation Plans (SIP's). Since emissions data comprise the most important input information for these models, any factor affecting the availability and completeness of the emissions data has a significant impact on the results of the modeling programs. Procedures for formatting emissions from point sources are well defined; however, area source emission data present problems. Usually the smallest geographic unit for which accurate primary data are available is the county. These data must be disaggregated and appropriately allocated to smaller areas to provide an adequately detailed input. The Computer Assisted Area Source Emissions (CAASE) gridding programs with associated subroutines containing automated gridding procedures provide an objective method for allocating county-level data to grid squares selected on the basis of demographic features and sized to give appropriate detail for input to air quality modeling programs. The first 5 files on this tape are the source code (Fortran) for the 5 programs, CAASE 1 through CAASE 5, that comprise the Computer Assisted Area Source Emissions Gridding Procedure. These files are written in card image format and coded in EBCDIC. File 6 contains data required when coordinate transformations from one UTM zone to another is necessary. File 7 containing U.S. county boundary coordinates is required input to the CAASE 2 program. Files 6 and 7 are coded in EBCDIC...Software Description: The program is written in the Fortran programming language for implementation on an IBM 370 computer using the OS operating system.