1. 2008-08-12 Re: [R-sig-Geo] accumulate gridcells to a specific va r-sig-geo Alexander.Herr 2. 2008-07-31 Re: [R-sig-Geo] accumulate gridcells to a specific va r-sig-geo Alexander.Herr 3. 2008-07-31 Re: [R-sig-Geo] accumulate gridcells to a specific va r-sig-geo Barry Rowlingson 4. 2008-07-30 [R-sig-Geo] accumulate gridcells to a specific value r-sig-geo Alexander.Herr