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editThis article was just now started in a semi-automated way, and could use more attention, perhaps including use of sources that might be found online. Please help! :) Try Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL and try Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL
Or vary that search. Try, for National Park Service material: Find sources: Google (books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL
Or develop from the sources already included in the article! Thanks. :) --doncram 23:14, 24 March 2011 (UTC)