FtD math is way easier than school math : r/FromTheDepths
Milestones in Science and Technology: The Ready Reference Guide to Discoveries, Inventions, and Facts Second Edition: List, Barbara A., Mount, Ellis A., List, Barbara: 9781573565509: Amazon.com: Books
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Would a smoothbore sniper rifle shooting sabot rounds work? - Quora
Amazon.com: Milestones in Science and Technology: The Ready Reference Guide to Discoveries, Inventions, and Facts, 2nd Edition: 9780897746717: Mount, Ellis, List, Barbara A.: Books