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United States. National Conservation Congress
Proceedings of the second National Conservation Congress at Saint Paul, September 5-8, 1910
Proceedings of the third National Conservation Congress at Kansas City, Missouri, September 25, 26 and 27, 1911
Proceedings [of the] fourth National Conservation Congress [at] Indianapolis, October 1-4, 1912
![Proceedings [of the] fourth National Conservation Congress [at] Indianapolis, October 1-4, 1912](https://cdn.readfeed.com/book_covers/fullsize/gutenberg-69706.jpg)