I agree with Bernard....the Paper Money of the United States" by Arthur and Ira Friedberg is about one of the best all around guides for US currency covering Colonials, Fractionals, Confederates, Large and small notes to the present.
The "Standard Guide to Small-Size U.S. PaperMoney 1928 to Date" by Swartz is great if your a block collector for small sized notes.
For Large sized star (replacement) notes..you will need "The Complete Catalog of United States Large Size Star Notes 1910-1929" by Douglas Murray.
Jeff