DXF linetypes to be used with TopDroid DXF export in CAD programs, by B. Holl
https://github.com/BalazsHoll/TopoDroid_manual_hu/raw/main/DXFlinetype.zip
QGIS symbols to be used with TopDroid shapefile export in QGIS, by B. Holl
https://github.com/BalazsHoll/TopoDroid_manual_hu/raw/main/QGISsymbol.zip
SVG drawing programs cave scrips, by Yuval Sobolyev