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There is article Road to Hali. Also for Delta Green You've got Impossible Landscapes campaign. Also look at the best scenario ever for classic era by @kross Have You seen the Yellow Sign.

Thank You very much! Your article is very useful.

There are some d20 stats and on the back one or two chapters about d20 NPCs and conversions notes. I think that's it.

John Hook have another four scenarios for one Keeper and one Player under His belt. But sadly they were part of Age of Cthulhu IX kickstarter, and now they are nowhere to be found. Sadly. I've got them, I've run them and they are superb.

For me both are greate for bigger groups. But there is no campaign for one player. I've run Masks of Nyarlathothep with Pulp Cthulhu rules for one player. I've learn a lot about such a big campaign from this experience. But it was a pain to scale everything down for just one player and too big in story for one player to remember and make notes. So something smaller but with glob trotting. Alone Against The Dark has some greate places inside. But it is for one player. Cold Fire Within and Two Headed Serpent are on my list of campaigns I want to run in future also but for a larger groups.

Yes @stadi, but with more globe trotting than Cold Fire Within and with good bunch of helpfull NPCs, with lots of maps. Yes, Yes! I can imagine something like that.

In Poland there is a book with ten one on one scenarios called "Face to face". It came out last december an it contains above mentioned three scenarios and seven more. Maybe Chaosium is going with something similar in English language? Here is the cover. What I would like to see is some kind of mini campaign for one on one style of game. It would be so cool. Something between Alone Against the Dark and Mask of Nyarlathotep, maybe in Pulp Style?

Apocthulhu anyone?

Try on Yog-Sothoth.com. Oscar Rios there is under @Golgoroth name.

The Ezoterrorist from Pelgrane Press got some cool ideas about stationary campaign. Worth to check them out!

Well Delta Green Countdown is and Delta Green Impossible Landscapes will be You go to material. In Tales of the Crescent City by Golden Goblin Press is chapter about KiY and one of the most prolific and enjoyable adventures of all time Have You Seen The Yellow Sign and a sequel of some sort.

Mythos Expeditions for Trial of Cthulhu got something also set in Yukatan or even in Mexico City IIRC.

Mysteries of Mesoamerica from Pagan Publishing.

There was some adventure from Ben Burns and New Comet Games, do not remember what was the name... But it was something like second part of The Hounting. As I recall @John Hook published another version of something happening after this adventure. Also cannot remember the title, but John is dweller here, so it is possible to ask him about that...

Superb material. Cannot wait for more!