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      Sadly the HOPL papers are not yet open access from the ACM but contemporary discussions can still be found http://lambda-the-ultimate.org/node/2811

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        Are these the ones at https://dl.acm.org/toc/pacmpl/2020/4/HOPL or has there been another HOPL conference post 2020?

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          That’s HOPL 4 which is open access but HOPL III and earlier are not.

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            I thought that ACM had opened their paywall. But that is only for 1950 - 2000 :( . So HOPL 3 is still behind the pay wall but HOPL 1 ( https://dl.acm.org/toc/sigplan/1978/13/8 ) and 2 ( https://dl.acm.org/doi/proceedings/10.1145/154766 ) are accessible.

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              Ooh, thanks for pointing that out, HOPL 1 was unobtanium last time I looked!

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        Perhaps tag this ‘historical’?