GRASS GIS Birthday

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29 July 1983

Jim Westervelt working on a GRASS map in the early 1980's at CERL

The first user manual for (what would become) GRASS GIS titled “GIS Version 1 Reference Manual” was published by J. Westervelt and M. O’Shea, on 29 July 1983. Jim Westervelt began work on what would become GRASS GIS earlier through his master's thesis, but the publishing date of the first user manual is the celebrated birth date of GRASS.