Careers for Your Characters by Raymond Obstfeld and Franz Neumann.
"Create well-developed characters using the descriptions of almost a hundred professions. Each entry consists of a description and details including educational requirements, salary, jargon, hazards, rewards, and more. Packed with sidebars and call-outs."
Published in 2002, the book is 336 pages and can be ordered from Amazon.com for just $13.29 plus shipping.