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I read the 1973 Edition and I believe that this edition (1959) is more of Graham than the later edition. Definitely the best reference on investing. You probably wouldn't need to read much more beyond this book to create a framework on investing and arrive at sound mind set around the topic
It was a nice read with very interesting facts written inside. It truly is a book of rarity. The book is a bit edged out all copy's come out like that no idea why but it is not really a bother and it still is a high quality book none the less.