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