Adventures With 1st Edition Lethalness

I have always thought that the summaries here of Maure Castle's/Mordenkainen's Fantastic Adventure contained excellent examples of 1st Edition AD&D (and before) lethalness.
The person's summaries of his group's experiences actually make me less enamored for having been mentioned as the "author" but somewhat more proud, instead, as a DM having always embraced a concept I was so often faced with as Robilar, who was constantly challenged across the gaming table by EGG's DM contrivances. Greyhawk Castle and Castle El Raja Key could be very lethal, and in many ways. Not that they were party killers (PK), but there were always chances that this might happen if the players did not think, of course. It is noteworthy that the above summary hits on many levels, as in "How" one dies that makes a legend, etc. It does bring back memories of the beginnings of D&D adventuring where all you could do in death was to become a legend; and by escaping same you became that same legend, a veteran, who was well respected by others in the party for having smarts, or at least luck. It was really refreshing reading that summary.

Can any of our other astute and informed members list other adventure modules that are in their experience as lethal or at least point towards being so? The systems are not important, but a nod towards 1st/2nd/OD&D would be nice (not including Tomb of Horrors, which is mentioned in the above summary).