References
^ G. Brent Hall (2012). Open Source Approaches in Spatial Data Handling, Springer. Product. ISBN 9783540748304 (revised May 2012)^ G. Brent Hall (2012). Open Source Approaches in Spatial Data Handling, Springer. Wiki. ISBN 9783540748304 (revised May 2012)^ Hall, G. Brent; Leahy, Michael G. (2014). Open Source Approaches in Spatial Data Handling, Springer Verlag. BiggerBooks. ISBN 9783540748304 (revised Nov 2023)
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