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A photograph of rolling hilly country and grassland.

Roosevelt Dam visit. Salt River project. Dam safety briefing. 1981.

Roosevelt Dam visit. Salt River project. Dam safety briefing. 1981.

An up-close photograph of manihot root and leaf.

A photograph of a mango tree pulled up from the group, exposing its root system. The exposed roots are 6 feet deep and the rootlets are very dark.

A photograph of long prop roots of a large tree in a forest.