United States. National Conservation Congress. Proceedings of the second National Conservation Congress at Saint Paul, September 5-8, 1910.
Цитирование в стиле Чикаго (17-е изд.)United States. National Conservation Congress. Proceedings of the Second National Conservation Congress at Saint Paul, September 5-8, 1910.
Цитирование MLA (9-е изд.)United States. National Conservation Congress. Proceedings of the Second National Conservation Congress at Saint Paul, September 5-8, 1910.
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