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- 4d from Helena ...(293 × 231 (20 KB)) - 22:35, 8 January 2010
- 4d from Helena ...(298 × 249 (23 KB)) - 22:36, 8 January 2010
- by Anna Petrasova, Aaron Hipp, and Helena Mitasova from North Carolina State University ...(1,272 × 734 (468 KB)) - 01:40, 18 July 2017
- Helena Mitasova 1, Vaclav Petras 2, Anna Petrasova 2, Markus Neteler 3 and GRASS G ...(999 × 562 (752 KB)) - 10:41, 3 January 2019
- Helena Mitasova 1, Vaclav Petras 2, Anna Petrasova 2, Markus Neteler 3 and GRASS G ...(915 × 724 (201 KB)) - 07:42, 3 January 2019