Re: Algol Mainframes ?
Also See
https://retrocomputing.stackexchange.com/questions/7953/first-language-with-c-like-memory-management
https://news.ycombinator.com/item?id=5349354
https://rosettacode.org/wiki/Memory_allocation#ALGOL_68
https://twitter.com/enf/status/1049453387492679682
https://www.dcs.gla.ac.uk/~wpc/hi/heaps.pdf
It looks like the Algol standard never specified how to collect garbage, though.
A comment from an Algol mainframe programmer would definitely be useful in this discussion.