Historical Data are a combination of documentary and field sources. These consist of documents and various historical sources to which the historian himself has access. These may include: materials of cultural history and analytical history, personal sources of authentic observers and witnesses, and these may consist of oral, written evidences, artifacts, etc. An example ii, M.Phil thesis under. Delhi University, 1989 on the development of collegiate programme in nursing in Assam contains Government documents, university minutes, TNAI report, interview with first Principal, Health Secretary, etc. which indicate "who proposed", "who supported and "who assisted" in the development of the institution.