Where was Confidential Assignment filmed?

From published sources

Places a newspaper, a film office, a broadcaster, a national film archive, a city filming permit or the production itself names, where no wiki records them. Each one below says where it comes from, with its source linked beside it: a sentence found on its page and read before the place was added, a permit a person matched to the production, or an archive's own record of the spot and the scene.

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