Government records are used as a reliable source on which historians can rely, because for this purpose, government historians are working, exploring and writing history. The work of government historians is different from university historians because they do not have the opportunity to freely interpret historical events. These may be independent scientists, military officers, civil servants, federal historians who use their training to search for all existing, available and less accessible information, that can be used in the writing of scientific books, articles, confidential policy documents or public documents. The work of government historians is very delicate, because their works must be reliable and accurate, otherwise they can cause serious controversy, unlike the works of university historians. Therefore, before publishing any of their work, verification by the administrator of the government agency responsible for the validity of the data must be performed. So, the reason is government records must be verified by those who collect it.