. . . It recounts the life of the officials, the notaries,
 the deputies, the proprietors of Indian labour, the
 priests, the miners and the Spaniards who travel
 from post to post along the roads and rivers of
 Peru; the visitors, the judges, the Indian chiefs
 and their subjects, including the very poor.
   In my work I have always tried to obtain the
 most truthful accounts, accepting those which
 seemed to be substantial and which were
 confirmed from various sources. I have only
 reported those facts which several people agreed
 upon as being true. . . .
  — Huamán Poma, Letter to a King: A Peruvian Chief’s
 Account of Life Under the Incas and Under Spanish Rule,
            E. P. Dutton
According to this author, accounts used in making
 statements of fact must be
 (1) brief     (3) verified
 (2) interesting    (4) unbiased