 Books that were included in Special Collections had to be printed in Europe before 1800 or printed in America before 1850; however, materials from a later date were accepted if they were considered rare due to high cost, were limited edition, or had pertinent content.Many BYU materials were left to the archivists as well.In 1957, Hansen was put in charge of manuscript collecting, and by 1958, he emphasized the manuscript collecting department in Special Collections.