New York City in Little Blue Books -
Clement Wood, 1926 (who also, in the course of his career, produced poetry, song lyrics, smutty stories, advice columns, a sequel to Tom Sawyer, and a rhyming dictionary).
The “Little Blue Books” were published by Emanuel Haldeman-Julius, of Girard, Kansas, from about 1919 to 1947. They were small, cheaply made, and sold for a nickel or dime. The covers were originally blue, but other colors were pressed into service if the card stock was cheaper. By the time the company crumbled, they had released over 2000 titles.
There were Little Blue Books on every possible subject: short stories, poetry, plays, literary essays, recipes, how-to books, biographies, histories. Haldeman-Julius had a distinctly progressive agenda; and printed many titles on socialism, atheism, evolution, contraception, and civil rights.
(text from blog)