I've begun linking to Goodreads in the title of each nomination in the list for quicker reference when perusing.
Since all previous nominations are complete, I'm going to offer three books, each at a hundred-something pages.
The Sorrows of Young Werther by Johann Wolfgang von Goethe
O Pioneers! by Willa Cather
Spoiler:
~176 pages
From Goodreads:
A tale of the prairie land encountered by America's Swedish, Czech, Bohemian, and French immigrants, as well as a story of how the land challenged them, changed them, and, in some cases, defeated them, Cather's novel is a uniquely American epic.
Alexandra Bergson, a young Swedish immigrant girl who inherits her father's farm and must transform it from raw prairie into a prosperous enterprise, is the first of Cather's great heroines, all of them women of strong will and an even stronger desire to overcome adversity and succeed. But the wild land itself is an equally important character in Cather's books, and her descriptions of it are so evocative, lush, and moving that they provoked writer Rebecca West to say of her: "The most sensuous of writers, Willa Cather builds her imagined world almost as solidly as our five senses build the universe around us."
Ficciones by Jorge Luis Borges