"I'm not entirely sure. The Necronomicon mentions them a few times but doesn't go into great detail. Apparently they come from space." 

Cam's version is not paper. He searches for various spellings.

The Mi-Go come from Yuggoth, which is not explicitly stated to be another planet but yeah it's another planet. Or planetoid. Or moon. It's a rock in space of some description, almost certainly. They fly through space. They do unspecified but ominously referred to things to people if bothered. Avoid.

Scale model of Yuggoth, sans Mi-Gos?

Pluto. 

"Okay, I know where this is, it's not terribly nearby. We can just avoid it."

"Good." 

"If we're going to try resurrecting someone can we try Mother."

"I'd recommend someone you aren't personally attached to as the test subject."

"...Okay. I don't know anyone who's dead who I'm not personally attached to." 

"Yes, I was thinking maybe Ben Franklin or something, since he's on record as having wanted to pickle himself for later restoration."

"...It sounds like you need remains," Wilbur observes, frowning at his copy of the Necronomicon, now flipped back to the resurrection ritual. "I don't know if it has to be the original remains or just chemically identical, the phrase 'Essential Saltes' is ambiguous." 

"I haven't read through the whole thing but I'm up for disinterring Franklin's bones if making a copy of his corpse in a fresher state doesn't work."

"Let's try it the other way first." 

"Much more convenient."

"We've gone this long without provoking an angry mob." 

"I wouldn't need to bring you along for the graverobbing part."

"That's probably for the best." 

"I've never robbed a grave before and it will certainly be less tedious to do this entire ritual if I don't have to. Hmm..." He reads through it a little more carefully.

You can use either a basically intact corpse or the "essential saltes," which may be concocted using the ashes of the deceased. The spells are different depending on whether or not the body has to be reconstituted. In the latter case it's possible to banish the resurrectee back to the dead without infliction of further violence through use of a counter-spell. 

There are incantations. The incantations invoke Yog-Sothoth. 

"You guys have any paternal rapport to speak of?" Cam wonders.

"We've never met him. I wouldn't be surprised if the blood connection still helped." 

"Is it rude to ask about the circumstances with your parents?"

"There's a ritual to summon Yog-Sothoth incompletely and temporarily, in Grandfather's copy of the Necronomicon. Mother used it. She wanted...she wanted children who would have more power than an unattractive albino and her widower father, neither with any formal education, living on cattle proceeds and a dwindled family fortune and despised by their neighbors, could aspire to. Instead she got...us." There is a soft rustling sound, as of snakeskin on snakeskin. "She loved us very much." 

Cam nods. "- what happened to her?"