The Arthashastra summarizes the political thoughts of Kautilya. This book was lost for many centuries until a copy of it, written on palm leaves, was rediscovered in India in 1904 CE. This edition is dated to approximately 250 CE, many centuries after the time of Kautilya, but the main ideas in this book are largely his. The book contains detailed information about specific topics that are relevant for rulers who wish to run an effective government. Diplomacy and war (including military tactics) are the two points treated in most detail but the work also includes recommendations on law, prisons, taxation, irrigation, agriculture, mining, fortifications, coinage, manufacturing, trade, administrations, diplomacy, and spies.