Erda

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Erda stands for:

Erda (Hohenahr) , a district of the municipality of Hohenahr in Central Hesse
Erda (Utah) , a location in the United States
a medieval district in today's Hesse, see Erdagau
Erda (Wagner) , an opera character by Richard Wagner
(894) Erda , a main belt asteroid

ERDA is an abbreviation for:

Elastic Recoil Detection Analysis , a material science investigation method, see elastic backscatter detection analysis