All files are named in terms of their geographic unit, geographic coverage, data and election and file type. Below is an example explaining this structure. Take a file with the following name: AA-BBB_CC00_DD-EEE-FF-GGG.XXX. AA-BBB would be the geographic unit. AA would be the type of geographic unit, and BBB would be for what year. For example, BL-C90 would be a geographic unit of Census Block from the 1990 Census. CC00 would be the geographic coverage. CC standing for the type of geographic coverage while 00 would stand for the numeric designation for the specific coverage. For example, CY19 would stand for County 19 (Los Angeles County). DD-EEE is the content, with DD standing for the source of the data, and EEE standing for the year. For example, RG-G94, would stand for Statement of Registration for the 1994 General Election. These content can be strung together, so FF-GGG would be a set of content contained in the same file. XXX stands for the file format, either DBF or DAT. So for example a file named bl-c90_cy19_rg-g94-sv-g94.dbf would be both election and registration data from the 1994 general election for Los Angeles County, broken down by census blocks, saved in DBase format.