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Re:The Programmer as Navigator (1973) [pdf] by greenyoda on Sunday December 14, 2014 @11:34PM (#8750681)
The URL just points back to the HN article.

It looks like the URL should be the following, which is a freely downloadable PDF from 1973 with the right title:

https://dl.acm.org/citation.cfm?id=362534

Re:The Programmer as Navigator (1973) [pdf] by dang on Monday December 15, 2014 @03:10AM (#8751064)
We put http://www.jdl.ac.cn/turing/pdf/p653-bachman.pdf in as the url since it goes to the article directly.