Depository Microfiche, 1981- .
Penn Library selects approximately 30% of the U.S. government documents available on deposit. While some depository documents are received in paper and are cataloged in Franklin, a larger number are available only on microfiche. Documents on microfiche are arranged by SuDocs number. Use the print Monthly Catalog, WorldCat, and the Catalog of U.S. Government Publications to find SuDocs numbers.