What are some must read books on strategy and planning?

I've found books on history to be useful.  Barbara Tuchman's book "The March of Folly: From Troy to Vietnam" is in particular useful.  I've also read a lot on the history of the Roman Empire, and the Cambridge Encyclopedia of China has a good chapter on the strategic planning of the Warring States and of the Han Dynasty.  http://www.amazon.com/Thinking-Time-Uses-History-Decision-Makers/dp/0029227917/ref=sr_1_1?ie=UTF8&qid=1386386960&sr=8-1&keywords=thinking+in+history by Richard E. Neustadt and Ernest R. May is also a good book. And then there is http://en.wikipedia.org/wiki/Thucydides The History of the Peloponnesian War and Confucius Spring and Autumn Annals.  There's also Josepheus History of the Jewish War. One reason that I focus a lot in history is that technology changes but biology does not.  To someone living in 2013, the world of 1950 or 2050 is going to be as alien in some ways as the Roman Empire, and if you go to another country, you are going to be seeing people doing very, very different things. If you go back and study Greek city-states, you'll discover things that were the same and things that aren't the same as the world of 2013, and this gives you some idea of what the world of 2023 could or would be like. And sometimes you end up with unexpected lessons.  A lot of the dialogues in Thucydides sound like business meetings I've been to.