Circulars provide practical information similar to guides but are often more comprehensive and can be as long as 40 pages. The more recent circulars are located in closed stacks. New Mexico State University. Bulletins are the results of major completed research projects. They can be individually searched by author, title, or subject.
Research reports are the result of ongoing research.
They are somewhat less complete than bulletins, though both are scholarly publications. These too can be individually searched by author, title, subject, or call number.