Most periodicals are kept for one (1) year.  Periodicals related toMontanaare kept permanently.   Information in reference, science, medical, and business areas is kept updated.

The discarding policy is followed when materials are withdrawn.  Materials relating to local historical events are maintained for research purposes.

Adopted12/17/91

Reviewed 10/97

Revised 04/05

Reviewed 8/08

Reviewed 6/12