A cover letter must be specific to the position and company, so write a new cover letter for each job. Always include a cover letter even if it is optional.Here you will learn about writing and revising cover letters for academic teaching jobs in the United States of America. Download our free Return to Work Letter template and explore samples for a smooth transition back to the workplace. This file provides detailed instructions and a sample cover letter to help you craft a personalized application. PDF • Word Format.