From the AAUP, Joint Statement on Faculty Status of College and University Librarians (Jan. 11, 2013):

“As the primary means through which students and faculty gain access to the storehouse of organized knowledge, the college and university library performs a unique and indispensable function in the educational process. This function will grow in importance as students assume greater responsibility for their own intellectual and social development. Indeed, all members of the academic community are likely to become increasingly dependent on skilled professional guidance in the acquisition and use of library resources as the forms and numbers of these resources multiply, scholarly materials appear in more languages, bibliographical systems become more complicated, and library technology grows increasingly sophisticated. The librarian who provides such guidance plays a major role in the learning process…”

Source: ACRL