Horace Howard Furness Memorial Library (University of Pennsylvania) 28,585
Harris Collection of American Poetry and Plays (Brown University) Poetry, 1951-1975 27,735
Harris Collection of American Poetry and Plays (Brown University) Broadsides 25,893
History of Medicine Collection (David M. Rubenstein Rare Book & Manuscript Library) 22,412
Harris Collection of American Poetry and Plays (Brown University) Poetry, 1976-2000 22,007
Haydn, Joseph, 1732-1809 20,681
Handel, George Frideric, 1685-1759 19,885
Harris Collection of American Poetry and Plays (Brown University) Poetry, 1926-1950 17,247
Harris Collection of American Poetry and Plays (Brown University) Collections and Anthologies 17,137
Harris Collection of American Poetry and Plays (Brown University) Poetry, 1901-1925 16,984
Harris Collection of American Poetry and Plays (Brown University) Poetry, 1609-1875 16,054
Harris Collection of American Poetry and Plays (Brown University) Music Scores and Collections 13,327
Harris Collection of American Poetry and Plays (Brown University) Poetry, 2001-2025 12,056
Harold Jantz Collection of German Baroque Literature and German Americana 11,653
Henry Charles Lea Library (University of Pennsylvania) 11,608
Harris Collection of American Poetry and Plays (Brown University) Poetry, 1876-1900 10,708
Harris Collection of American Poetry and Plays (Brown University) Plays, 1901-1925 10,214
Harris Collection of American Poetry and Plays (Brown University) Plays, 1926-1950 9,708
Hôtel Drouot 8,160
Homer 6,867
Harvard University Graduate School of Education 6,772
Horace 6,301
Hindemith, Paul, 1895-1963 6,290
History of Science Collection (Brown University) 5,933
Harris Collection of American Poetry and Plays (Brown University) Periodicals 5,915
Hugo, Victor, 1802-1885 5,039
Horace Howard Furness Memorial Fund 4,896
Harris Collection of American Poetry and Plays (Brown University) Plays, 1976-2000 4,754
Harris Collection of American Poetry and Plays (Brown University) Plays, 1951-1975 4,694
Harris Collection of American Poetry and Plays (Brown University) Reference Works 4,054
Harvard University 3,895
H.M. Gousha Company 3,761
Hanawa, hokinoichi 3,549
Harris Collection of American Poetry and Plays (Brown University) Hymnals with Music 3,474
Harry E. Humphreys Book Fund 3,307
Hazel M. Hussong Fund 3,260
Harvard University Graduate School of Design 3,197
Heine, Heinrich, 1797-1856 3,170
Harry Lyman Koopman Collection (Brown University) 3,101
Harvard Law School 3,089
Harris Collection of American Poetry and Plays (Brown University) Plays, 1876-1900 2,512
Human Rights Watch (Organization) 2,469
Hawthorne, Nathaniel, 1804-1864 2,338
Hardy, Thomas, 1840-1928 2,335
Hippocrates 2,276
Holst, Gustav, 1874-1934 2,250
Harvard University Department of Anthropology 2,240
Hofmannsthal, Hugo von, 1874-1929 2,178
Hôtel Drouot 2,148
Honegger, Arthur, 1892-1955 2,111
Hebrew Manuscripts (Columbia University. Libraries) 2,100
Harris Collection of American Poetry and Plays (Brown University) Plays, 2001-2025 2,081
Holmes, Oliver Wendell, 1809-1894 2,027
Haldeman-Julius, E (Emanuel), 1889-1951 2,000
Harris Collection of American Poetry and Plays (Brown University) Latin American Poetry 1,984
Hummel, Johann Nepomuk, 1778-1837 1,971
Hopkins, John, -1570 1,927
Harris Collection of American Poetry and Plays (Brown University) Plays, 1609-1875 1,868
Harris Collection of American Poetry and Plays (Brown University) Songsters 1,806
Henze, Hans Werner, 1926-2012 1,780
Harnoncourt, Nikolaus 1,768
Hesse, Hermann, 1877-1962 1,760
Harris Collection of American Poetry and Plays (Brown University) French Canadian Poetry, 1976-2000 1,735
Harris Collection of American Poetry and Plays (Brown University) Collections and Anthologies of Plays 1,726
Henty, G. A (George Alfred), 1832-1902 1,722
Hungary 1,665
Habimah 1,663
Hogwood, Christopher 1,662
Howells, William Dean, 1837-1920 1,653
Haydn, Michael, 1737-1806 1,639
Hume, David, 1711-1776 1,637
Henry E. Huntington Library and Art Gallery 1,630
Harris Collection of American Poetry and Plays (Brown University) French Canadian Poetry, 1951-1975 1,604
Hughes, Langston, 1902-1967 1,583
Herodotus 1,556
Hemingway, Ernest, 1899-1961 1,546
Harold L. Tinker Collection (Brown University) 1,538
Hammerstein, Oscar, II, 1895-1960 1,501
Hoffmann, E. T. A (Ernst Theodor Amadeus), 1776-1822 1,489
Herbert, Victor, 1859-1924 1,483
Hegel, Georg Wilhelm Friedrich, 1770-1831 1,464
Hickox, Richard, 1948-2008 1,452
Haitink, Bernard, 1929-2021 1,423
Historical Society of Pennsylvania 1,410
Harris Collection of American Poetry and Plays (Brown University) Walt Whitman 1,391
Human Rights Archive (Duke University) 1,383
Hovhaness, Alan, 1911-2000 1,364
Harris Collection of American Poetry and Plays (Brown University) Hymnals 1,361
Hickey, Matthew 1,343
Home Box Office (Firm) 1,331
Hall, Joseph, 1574-1656 1,330
Harris Collection of American Poetry and Plays (Brown University) French Canadian Poetry, 2001-2025 1,324
Hogarth, William, 1697-1764 1,315
Harte, Bret, 1836-1902 1,314
Heifetz, Jascha, 1901-1987 1,302
Hale, Edward Everett, 1822-1909 1,301
Hasse, Johann Adolf, 1699-1783 1,298
Howells, Herbert, 1892-1983 1,279
Heidegger, Martin, 1889-1976 1,270
Hobbes, Thomas, 1588-1679 1,268