Infobase eBooks This link opens in a new windowInfobase eBooks offers online access to many titles in the Facts on File series, "Career Opportunities." Each volume contains in-depth profiles of approximately 60 to 100 jobs, providing thorough information on salary ranges, employment trends, necessary experience, advancement prospects, and helpful unions and associations. Each profile presents an overview of the main duties and features of the job, a Career Ladder that illustrates frequent routes to and from the position, and comprehensive descriptions of certification, education, special skills, and training required.