1. 2018-12-05 Re: [R-sig-Geo] How to test for a layer in GRASS GIS r-sig-geo Christian Willmes 2. 2018-12-04 Re: [R-sig-Geo] How to test for a layer in GRASS GIS r-sig-geo Micha Silver 3. 2018-12-04 Re: [R-sig-Geo] How to test for a layer in GRASS GIS r-sig-geo Roger Bivand 4. 2018-12-04 Re: [R-sig-Geo] How to test for a layer in GRASS GIS r-sig-geo Rich Shepard 5. 2018-12-04 [R-sig-Geo] How to test for a layer in GRASS GIS maps r-sig-geo Christian Willmes