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