In the continuing promotion for Nirvana's 20th anniversary of In Utero, Sub Pop Records has released the first page of their contract with Nirvana starting in 1989 via their Tumblr page:
A note below the contract says, "Nirvana’s original contract with Sub Pop. Six hundred bucks well spent—not that we had it at the time."
$600 for the first year, with options for $12,000 during the second year, and $24,000 for the third year of a 3 year contract. This is more than just history, it's a recipe for how an independent record label was able to develop young rock musicians to become the biggest band in the world.
Also of note, Dave Grohl's name isn't on the contract as he hadn't become the drummer yet.
For more behind the scenes information on Nirvana and In Utero, check out this interview with producer Steve Albini.