I hold in my hand a printout of Jensen's article from Annals of Mathematical Logic 4 (1972) named as in the title of the question.

However the quality of the .pdf I found was very bad and it is very hard to read it, furthermore the article was written in days before LaTeX and the symbols are non-standard for current articles (e.g. $\bigwedge$ for $\forall$ and such).

Moreover, I was told that there is some mistake somewhere in the beginning of the article, it is not a grave mistake, some result that he doesn't prove there. But it is a mistake nonetheless.

Regardless to the two problems, I was told that this is a very good article for studying the topic.

Is there a "digitally remastered" version somewhere online with the error(s) corrected and a clearer typeset?

(I got mine from the ScienceDirect website)

[I'm not sure that this is the place for this question, however I have no idea where would be the place for it. Any comments and/or directions about this issue would be most welcomed]

Constructibilityis a more recent reference which contains much of Jensen's early results. – François G. Dorais♦ Sep 13 '10 at 13:11