2 द्वारा ईबुक Michelle L. Erickson
Michelle L Erickson: Safe School Initiative
Following the attack at Columbine High School in April 1999, the Secret Service and the Department of Education initiated a study of thinking, planning and other pre-attack behaviors engaged in by at …
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€243.13
Mikael Jantunen: Unconventional Oil and Natural Gas
The United States has seen a resurgence in petroleum production, mainly driven by technology improvements (hydraulic fracturing and directional drilling) developed for natural gas production from sha …
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DRM
€230.38