Can you identify the fictional origins of these non-fiction books?

Designer Daniel Gray writes in to tell us about his new publishing venture, Vulture Books, which is bringing out lovely, high-quality versions of all your favorite non-fiction works that exist only in fiction. Can you identify where all these books are from?

Gray explains the publishing house:

Vulture Books: classic non-fiction texts* illuminating the darker corners of human thinking, published as paperbacks for the first time. Ideal for sharing, pocketing and inducing metaphysical despair.

* texts may or may not actually exist

You can learn more about Gray's work, and Vulture Press, on his site.

Can you identify the fictional origins of these non-fiction books?

Can you identify the fictional origins of these non-fiction books?

Can you identify the fictional origins of these non-fiction books?

Can you identify the fictional origins of these non-fiction books?

Can you identify the fictional origins of these non-fiction books?

Can you identify the fictional origins of these non-fiction books?