In addition to raw data and unpublished manuscripts, libraries also hold back copies of journals and newspapers.
Historical research or historiography, "attempts to systematically recapture the complex nuances, the people,meanings,events,and even ideas of the past that have influenced and shaped the present". (Berg & Lure, 2012, p. 305 )
Historical research relies on a wide variety of sources, both primary & secondary including unpublished material.
Historical research involves the following steps:
(Berg & Lune, 2012, p.311)