| http://www.w3.org/ns/prov#value | - However, comparison with other forms of transportation is more difficult because automobile, railroad and nautical travel tend to have more even risk throughout a trip than does flight. (http://www.ntsb.gov/default.htm) This problem is well recognized in the field of injury epidemiology and was outlined by Robertson in his text ??Injury Epidemiology?? on page 41: ??Aircraft usually crash during at
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