One demonstrable effort is the formulation and implementation of a written depository collection development policy which specifically articulates the library's strategy for identifying and meeting the Government information needs of the local area. This policy can be formulated using the same criteria discussed in Section 2 of the Federal Depository Library Manual . The basis for selection is the List of Classes of United States Government Publications Available for Selection by Depository Libraries and the Union List of Item Selections . The latter publication is available only in microfiche. These lists include those series or groups of publications having a public or educational value which are issued by the various departments and agencies of the U.S. Government.
Cooperative publications are documents which are self-sustaining.
Their continued existence depends on funds raised by selling copies of the publication. For this reason, they are not available for free distribution through the Federal Depository Library Program. Entries for these publications do appear in the Monthly Catalog . Such titles as the National Union Catalog and the National Park Service Trends , Grist , and Design fall within this category. D. Item Number Selections Depository libraries select documents by categories.