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Proceedings of the second National Conservation Congress at Saint Paul, September 5-8, 1910
by United States. National Conservation Congress
![Proceedings [of the] fourth National Conservation Congress [at] Indianapolis, October 1-4, 1912](https://www.gutenberg.org/cache/epub/69706/pg69706.cover.medium.jpg)
Proceedings [of the] fourth National Conservation Congress [at] Indianapolis, October 1-4, 1912
by United States. National Conservation Congress