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A comment on The Programmer as Navigator (1973) [pdf].
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
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