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Once the risks are known , decisions can be made about what actions can be taken in advance and what actions would be required once the disaster occurs . If needed , students can even ask the Webmaster questions . As history has taught , astronomers can always expect the unexpected . If a tracing has not been compiled , researchers can still examine the legislative committee minutes by using the bill 's measure history from the Oregon State Legislature 's Web site . Where these do not exist , or have been destroyed , landowners can easily frustrate the process of land acquisition .