Columbia subject headings:
Harvard subject headings:
Doctor of philosophy degree--United States--Evaluation.
Research--United States--Evaluation.
Science--Study and teaching (Higher)--United States--Evaluation.
Universities and colleges--United States--Graduate work--Evaluation.
Princeton subject headings:
Chemistry--Study and teaching (Graduate)--United States.
Earth sciences--Study and teaching (Graduate)--United States.
Mathematics--Study and teaching (Graduate)--United States.
Physics--Study and teaching (Graduate)--United States.