1. 2008-02-24 Re: [R-sig-Geo] Shortest path around obstacles (OT) r-sig-geo Rick Reeves 2. 2008-02-24 Re: [R-sig-Geo] Shortest path around obstacles (OT) r-sig-geo hadley wickham 3. 2008-02-24 [R-sig-Geo] Shortest path around obstacles (OT) r-sig-geo Don MacQueen