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In page Occupation of the Hainburger Au:

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The number of signatures needed under the constitution for a "referendum" [1] had only recently been doubled from 100,000 to 200,000. The "Konrad Lorenz Referendum", on the proposal for the Hainburger Au to be protected as a designated National Park, took place in March 1985 and attracted 353,906 signatures.[citation needed]