Rifle in Hand: How Wild America Was Saved - Conservation History Book for Outdoor Enthusiasts & Nature Lovers" （如果原中文标题是"手持步枪：狂野美国如何被拯救"） 优化说明： 1. 保留核心关键词"Rifle"和"Wild America" 2. 增加内容类型说明"Conservation History Book" 3. 添加目标受众关键词"Outdoor Enthusiasts & Nature Lovers" 4. 符合SEO规范的关键词布局 5. 英文翻译准确 6. 增加了使用场景（户外爱好者和自然爱好者阅读）

The third volume in Mr. Posewitz's series on American Hunting, Rifle in Hand examines the critical role of American hunters, especially Theodore Roosevelt, George Bird Grinnell, D'ing Darling, Aldo Leopold, and others, in saving the wild lands and wildlife of North America during the 20th century and their role in creating the highly successful American model of wildlife conservation.