I'm not sure about works exactly like 'kamion and other dark stories'. But 'The Strange Case of Dr. Jekyll and Mr. Hyde' has a bit of a dark undertone. It's about a man with a split personality, one good and one evil.
Well, perhaps the story about the old abandoned house. The descriptions of the dark, dusty rooms and the feeling of being watched make it really scary. It's like you can almost feel the coldness and unease as you read about the protagonist exploring the place.
In 'dark dark room and other scary stories', the tale of the cursed mirror might be quite scary. The thought that looking into a mirror could bring some sort of malevolent force into your life, and that it might show you things that aren't supposed to be seen, is really spooky. It plays on our superstitions about mirrors and the fear of the supernatural.
The story 'In the Dark, Dark Room' itself is quite terrifying. The setting of a dark room where unknown and scary things lurk creates a spooky atmosphere. The description of the place makes you feel as if you are there in that menacing room, waiting for something to jump out at you.
One of the scariest could be the one about the haunted attic. The description of the creaking floorboards and the strange noises coming from the old boxes up there gives a really spooky feeling.
One of the scariest is probably 'The Green Ribbon'. The idea of a girl always wearing a green ribbon around her neck and the mystery behind it is really creepy.
Well, perhaps the scariest story is about a family who moves into a new house, only to discover that there are shadowy apparitions that haunt the hallways. These apparitions seem to mimic the family's movements, but in a distorted and menacing way. The story builds tension as the family tries to figure out what these entities are and how to get rid of them.
It could be about various things. Maybe it's a collection of stories where 'dark integers' play a central role, perhaps in a science - fiction or mystery context, but without reading it, it's hard to be more specific.