For what they are worth, here are some more facts and opinions (which I will clearly distinguish

regarding Security Analysis that may be of interest to aspiring readers.
In my opinion, the longevity of the Security Analysis work has resulted primarily from continued recognition of Mr. Benjamin Graham's genius as its principal author supported by Mr. David Dodd (a very, very smart investor in his own right).
McGraw Hill has published Security Analysis in five editions spanning over 50 years.
1st edition published 1934
2nd edition published 1940
3rd edition published 1951
4th edition published 1962
5th edition published 1987
In my opinion, the first four Security Analysis editions are best viewed as balance-sheet-like snapshots of Graham and Dodd's genius as it observed and interacted with the dynamic securities markets across that historical period. Mr. Graham died in 1976 -- the 5th edition has no authorship by Mr. Graham and reads quite differently from the first four.
I personally have found Janet Lowe's book "Benjamin Graham on Value Investing" to provide a rather helpful context in reading Security Analysis.