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| Environmental sampling -- North Dakota. (1) |
| Environmental sampling -- Wyoming. (1) |
| Plant-soil relationships -- North Dakota. (1) |
| Plant-soil relationships -- Wyoming. (1) |
| Triglochin maritima -- Ecophysiology -- North Dakota. (1) |
| Triglochin maritima -- Ecophysiology -- Wyoming. (1) |
| Triglochin maritima -- North Dakota -- Composition. (1) |
| Triglochin maritima -- Wyoming -- Composition. (1) |