Wilderness NavigationMap and Compass Navigation Techniques and Orienteering SkillsDo you want to learn about wilderness navigation and orienteering in a simple and easy to understand way? This easy to
Preparedness for EMP Attack and Solar StormsA Survival Guide to EMP Weapons, Electromagnetic Pulse, Solar Storms, Solar Flares and Carrington EventsThis fantastic guide to EMP attack and solar storm s
The Preppers Apocalypse Survival Guide book series by Steve Rayder is quickly growing inpopularity in the prepping community. With thousands of copies being read by preppers around the world within mo
本書講述了早期哈佛大學乃至整個美國的數學發展史，讀者可以從中了解到哈佛數學系如何從只有一個教職人員發展到***研究中心，以及哈佛在美國數學發展中起到的重要作用。全書內容包括：開端，Benjamin Peirce與“引出必要結論”的科學，Osgood、B?cher和美國數學的偉大覺醒，George David Birkhoff的強勢登場，分析學和代數學與拓撲學相遇，最復雜
