LC ClassificationTJ1-1570

Africa(331) ai(88) architecture(163) artificial intelligence(178) biography(316) children(143) children's(192) climate change(72) complexity(78) computer(99) computer science(295) computers(210) computing(57) conservation(87) construction(322) control(83) design(141) diy(201) ecology(97) economics(125) education(111) energy(1,201) engineering(1,333) environment(385) environmentalism(47) experiments(59) famine(91) global warming(44) green(69) handbook(62) history(1,132) homesteading(56) how things work(30) how-to(180) humble(53) informational(176) invention(70) inventions(128) inventors(98) machines(424) manufacturing(42) math(188) mills(46) natural science(48) oil(46) peak oil(46) photographs(97) photography(131) picture book(508) programming(323) projects(52) railroading(50) reference(627) robotics(949) robots(558) school(255) science(2,371) Science & Technology(47) science nonfiction(31) self-sufficiency(45) sustainability(190) sustainable living(50) tech(35) thermodynamics(208) tools(753) trades(22) trains(642) trucks(57) usa(107) vehicles(189) wind(104) windmill(42) windmills(138) wood(42) workshop(36)