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Which organizations conducted much of the late 20th-century research at Olympia?

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Map of southeastern Europe highlighting Greece and marking the location of Olympia with a red star, indicating its status as a World Heritage Site. Olympia is shown in the western part of the Peloponnese peninsula, surrounded by neighboring countries and nearby seas including the Ionian, Aegean, and Mediterranean. — Olympia Olympia was declared a UNESCO World Heritage site in 1989.

In the late 20th century, archaeological research at the ancient site of Olympia was conducted primarily by the following two organizations:

The German Archaeological Institute in Athens1
The Ephorate (Magistrate) of Antiquities in Olympia1