At the age of 26, Warren Buffett founded Buffett Partnership Limited, which lasted from 1956 to 1970. During this time he wrote 33 letters to his small but growing group of partners. These letters chronicle his thoughts, approaches and reflections in the period immediately prior to his Berkshire Hathaway tenure - one that saw an unprecedented record of investing success.

This early period was astonishing: in 1968 he beat the Dow by more than 50%. Because Buffett wanted to ensure that his partners understood his process, he wrote letters. In them, he sets out what he termed "ground rules" for investing that remain startlingly relevant today for every type of investor - from beginners t