Horace Howard Furness Memorial Library (University of Pennsylvania) 28,586 Harris Collection of American Poetry and Plays (Brown University) Poetry, 1951-1975 27,733 Harris Collection of American Poetry and Plays (Brown University) Broadsides 25,893 History of Medicine Collection (David M. Rubenstein Rare Book & Manuscript Library) 22,411 Harris Collection of American Poetry and Plays (Brown University) Poetry, 1976-2000 22,008 Haydn, Joseph, 1732-1809 20,628 Handel, George Frideric, 1685-1759 19,874 Harris Collection of American Poetry and Plays (Brown University) Poetry, 1926-1950 17,246 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 16,052 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 12,057 Harold Jantz Collection of German Baroque Literature and German Americana 11,652 Henry Charles Lea Library (University of Pennsylvania) 11,605 Harris Collection of American Poetry and Plays (Brown University) Poetry, 1876-1900 10,707 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 6,860 Harvard University Graduate School of Education 6,770 Horace 6,298 Hindemith, Paul, 1895-1963 6,286 History of Science Collection (Brown University) 5,933 Harris Collection of American Poetry and Plays (Brown University) Periodicals 5,915 Hugo, Victor, 1802-1885 5,038 Horace Howard Furness Memorial Fund 4,897 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 4,055 Harvard University 3,899 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 3,169 Harry Lyman Koopman Collection (Brown University) 3,101 Harvard Law School 3,077 Harris Collection of American Poetry and Plays (Brown University) Plays, 1876-1900 2,512 Human Rights Watch (Organization) 2,469 Hawthorne, Nathaniel, 1804-1864 2,336 Hardy, Thomas, 1840-1928 2,333 Hippocrates 2,276 Holst, Gustav, 1874-1934 2,247 Harvard University Department of Anthropology 2,237 Hofmannsthal, Hugo von, 1874-1929 2,172 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 2,026 Haldeman-Julius, E (Emanuel), 1889-1951 1,997 Harris Collection of American Poetry and Plays (Brown University) Latin American Poetry 1,984 Hummel, Johann Nepomuk, 1778-1837 1,968 Hopkins, John, -1570 1,927 Harris Collection of American Poetry and Plays (Brown University) Plays, 1609-1875 1,867 Harris Collection of American Poetry and Plays (Brown University) Songsters 1,806 Henze, Hans Werner, 1926-2012 1,779 Harnoncourt, Nikolaus 1,766 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 1,652 Haydn, Michael, 1737-1806 1,638 Hume, David, 1711-1776 1,638 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 1,579 Herodotus 1,554 Hemingway, Ernest, 1899-1961 1,544 Harold L. Tinker Collection (Brown University) 1,538 Hammerstein, Oscar, II, 1895-1960 1,499 Hoffmann, E. T. A (Ernst Theodor Amadeus), 1776-1822 1,486 Herbert, Victor, 1859-1924 1,484 Hegel, Georg Wilhelm Friedrich, 1770-1831 1,462 Hickox, Richard, 1948-2008 1,452 Haitink, Bernard, 1929-2021 1,422 Historical Society of Pennsylvania 1,413 Harris Collection of American Poetry and Plays (Brown University) Walt Whitman 1,391 Human Rights Archive (Duke University) 1,380 Hovhaness, Alan, 1911-2000 1,364 Harris Collection of American Poetry and Plays (Brown University) Hymnals 1,361 Hickey, Matthew 1,341 Hall, Joseph, 1574-1656 1,329 Home Box Office (Firm) 1,327 Harris Collection of American Poetry and Plays (Brown University) French Canadian Poetry, 2001-2025 1,324 Hogarth, William, 1697-1764 1,314 Harte, Bret, 1836-1902 1,313 Hale, Edward Everett, 1822-1909 1,303 Heifetz, Jascha, 1901-1987 1,302 Hasse, Johann Adolf, 1699-1783 1,297 Howells, Herbert, 1892-1983 1,278 Heidegger, Martin, 1889-1976 1,269 Hobbes, Thomas, 1588-1679 1,268