That case report notes a 10x dose, a 5x dose (these are pretty standard), and a very loose description of snorting 55mg of powdered LSD, which I don't buy. I've seen enough folks eat a sheet or down a 10k mic vial and trip for a week+ to know better. Possibly the dose report was well off, or snorting it and fortunately they didn't get much of it or it wasn't pure LSD-25.
The linked reported "massive overdose from the 70's case" is also fairly bogus, in my opinion. Look deeper in the report and see the serum levels quoted and one of the highest of one of 7 patients recorded was 26ng/ml? That's effectively like taking 6-7 hits of LSD at approximate dosage of 200 microgram per dose. So what's "massive," and what does that mean then, if that person was comatose off only 6 medium sized doses of LSD, right? That is not anywhere near hundreds of doses.
I also have a lot of doubt about the last one. The first two are light users having strong emotional reactions to amounts that would be an un-notable recreational amount for others. 55mg is nuts. Five hits won't really even make you hallucinate.
As old hippies used to tell me in the 90s, pot is 100x stronger than it was in the 60s, and LSD is 100x weaker.