O*NET OnLine"O*NET OnLine has detailed descriptions of the world of work for use by job seekers, workforce development and HR professionals, students, researchers, and more!" (O*NET OnLine website)
Occupational Outlook Handbook (OOH)"The Occupational Outlook Handbook (OOH) is a career resource offering information on the hundreds of occupations that provide the majority of jobs in the United States." (OOH website)
Professional Organizations
Association of Diesel Specialists (ADS)The Association of Diesel Specialists (ADS) is the worldwide diesel industry's leading trade association, dedicated to the highest level of service on diesel fuel injection and related systems