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Field studies are studies that focuses on a particular subject, they can be really about any subject at all that displays data.
Robert R. Compton has written:
'Geology in the field' -- subject(s): Field work, Geology
'Manual of field geology' -- subject(s): Field work, Geology
Subject matter, theme, matter in hand, field, subject...
Engineering is a field or subject to be studied, a doctorate is a qualification in a field of study.