The Halmos College of Natural Sciences and Oceanography requires a minimum of three letters of recommendation. These signed documents are to be written on the appropriate letterhead, and are to be sent directly to the Graduate Program Office. If recommendation is sent by the student, the recommender must sign the seal of the envelope. Letters must come from professors or class instructors. An exception can be made if the applicant has been out of school for a long period of time, in which case, an employment supervisor's letter will be adequate.