Below you will find some GIS resources. You are free to download and use this data. I only ask that you reference my website. If you are interested in a high definition copies, please contact me.

The Pampas Region of Argentina (map in Spanish). Created in QGIS https://www.qgis.org/en/site/ .

https://drive.google.com/file/d/0B2oo8Ps9UigOdnhycWMwUFFKMm8/view?usp=drive_web

This is a workflow for doing hydrology analysis in QGIS and GRASS.

Hydrology QGIS and GRASS.pdf