Some of Biddle’s federal documents are housed in Tanenbaum Hall in Biddle Law Library, while others are housed in the William Draper Lewis Collection in Silverman Hall (also known as the “Lewis Collection”). Those housed in Silverman Hall are in closed stacks and have to be retrieved by library staff. If you need a document shelved in the Lewis Collection, go to the Circulation Desk to request that the book be retrieved for you.
If you know the SuDoc number:
Ask a Reference Librarian for assistance. The Reference Librarian will determine whether or not Biddle is likely to have the document you need by consulting the latest List of Classes of United States Government Publications Available for Selection by Depository Libraries, located in Ready Reference, SuDoc #: [SuDocs GP 3.24].
If you have only an author, subject or keyword of a document, you can try searching Catalog Search or the card catalog. However, it will be easier to find if you have the title or SuDoc number. There are several indexes, listed here, that might help you determine exactly which document you are looking for.