| The biogeographic evidence supporting the Pleistocene forest refuge hypothesis E Mayr, RJ O’Hara Evolution 40 (1), 55–67, 1986 | 385 | 1986 |
| Homage to Clio, or, toward an historical philosophy for evolutionary biology RJ O’Hara Systematic Zoology 37 (2), 142–155, 1988 | 374 | 1988 |
| Population thinking and tree thinking in systematics RJ O’Hara Zoologica Scripta 26 (4), 323–329, 1997 | 236 | 1997 |
| Systematic generalization, historical fate, and the species problem RJ O’Hara Systematic Biology 42 (3), 231–246, 1993 | 216 | 1993 |
| Telling the tree: Narrative representation and the study of evolutionary history RJ O’Hara Biology and Philosophy 7 (2), 135–160, 1992 | 162 | 1992 |
| Cladistic analysis of an Old Norse manuscript tradition PMW Robinson, RJ O’Hara Research in Humanities Computing 4, 115–137, 1996 | 96 | 1996 |
| Representations of the natural system in the nineteenth century RJ O’Hara Biology and Philosophy 6 (2), 255–274, 1991 | 87 | 1991 |
| A computer approach to the comparison and identification of species in difficult taxonomic groups EE Williams, H Rand, AS Rand, RJ O’Hara Breviora 502, 1–47, 1995 | 84 | 1995 |
| Evolutionary history and the species problem RJ O’Hara American Zoologist 34 (1), 12–22, 1994 | 65 | 1994 |
| Trees of history in systematics and philology RJ O’Hara Memorie della Società Italiana di Scienze Naturali e del Museo Civico di …, 1996 | 64 | 1996 |
| Systematics and the study of natural history, with an estimate of the phylogeny of the living penguins (Aves: Spheniscidae) RJ O’Hara Ph.D. dissertation, Harvard University, 1989 | 53* | 1989 |
| Computer-assisted methods of stemmatic analysis RJ O’Hara, PMW Robinson Occasional Papers of the Canterbury Tales Project 1, 53–74, 1993 | 48 | 1993 |
| Report on the textual criticism challenge 1991 PMW Robinson, RJ O’Hara Bryn Mawr Classical Review 3 (4), 331–337, 1992 | 47 | 1992 |
| Diagrammatic classifications of birds, 1819–1901: Views of the natural system in 19th-century British ornithology RJ O’Hara Acta XIX Congressus Internationalis Ornithologici, 2746–2759, 1988 | 34* | 1988 |
| How to build a residential college RJ O’Hara Planning for Higher Education 30 (2), 52–57, 2001 | 31 | 2001 |
| Essay-review of Sibley and Ahlquist’s “Phylogeny and Classification of Birds” RJ O’Hara Auk 108 (4), 990–994, 1991 | 30* | 1991 |
| The Collegiate Way: Residential Colleges and the Renewal of University Life RJ O’Hara The Collegiate Way (collegiateway.org), 2000 | 24* | 2000 |
| The Richmond Index to the Genera and Species of Birds CW Richmond, RJ O’Hara GK Hall & Company, 1992 | 17 | 1992 |
| Mapping the space of time: Temporal representation in the historical sciences RJ O’Hara Memoirs of the California Academy of Sciences 20, 7–17, 1996 | 15* | 1996 |
| Hogwarts U RJ O’Hara Inside Higher Ed 2006 (28 November), 2006 | 10 | 2006 |
| American higher education and the “collegiate way of living” (美国高等教育和 “学院制生活”) RJ O’Hara Community Design 30 (2), 10–21, 2011 | 9* | 2011 |
| Crisis in systematics RJ O’Hara, DR Maddison, PF Stevens Science 241 (4863), 275–276, 1988 | 8 | 1988 |
| Ancient Greek Coins of Miletus RJ O’Hara rjohara.net, 2009 | 4 | 2009 |
| Strickland and Wallace, and the systematic argument for evolution RJ O’Hara American Zoologist 27 (4), 107A, 1987 | 4 | 1987 |
| Publications of Stephen Toulmin: A working bibliography RJ O’Hara SSRN 2542900, 2006 | 3 | 2006 |
| Pasta with a side order of philosophy, please RJ O’Hara Times Higher Education Supplement 2004 (20 August), 14, 2004 | 3 | 2004 |
| The names Ahab and Ishmael in early Massachusetts RJ O’Hara Notes and Queries 62 (3), 417–418, 2015 | 2 | 2015 |
| Trees of history in systematics, historical linguistics, and stemmatics: A working interdisciplinary bibliography RJ O’Hara SSRN 2540351, 2006 | 2 | 2006 |
| Problems in the narrative representation of evolutionary history RJ O’Hara American Zoologist 28 (4), 144A, 1988 | 2 | 1988 |
| Vita: Chauncey Wright—Brief life of an “indolent genius”: 1830–1875 RJ O’Hara Harvard Magazine 96 (4), 42–43, 1994 | 1 | 1994 |
| Was Ishmael black? Facts behind Herman Melville’s fiction RJ O’Hara Journal of African American History 102 (3), 380–386, 2017 | | 2017 |
| Moby Dylan: An analysis of Bob Dylan’s summary of Moby-Dick in his 2017 Nobel Lecture RJ O’Hara SSRN 2984395, 2017 | | 2017 |
| Inscriptions from the West Street Cemetery in Fitchburg, Massachusetts (1798–1879), with an outline of the early Marshall families in Fitchburg’s Laurel Hill Cemetery RJ O’Hara MASSOG 40 (3), 79–87; 41 (1), 17–24, 2016 | | 2016 |
| “Oh, God! to think Man ever comes too near his Home!”: Thomas Hood’s poem “The Lee Shore” as a source for Moby-Dick RJ O’Hara Leviathan 18 (2), 39–52, 2016 | | 2016 |
| Reply to Lincoln Caplan’s profile of law professor Cass Sunstein,“The Legal Olympian” RJ O’Hara Harvard Magazine 117 (4), 7, 2015 | | 2015 |
| “To gather from the air a live tradition” RJ O’Hara Inside Higher Ed 2007 (21 December), 2007 | | 2007 |
| Against theme halls RJ O’Hara Student Affairs Leader 35 (22), 1–2, 2007 | | 2007 |
| Take Time to Visit the ‘Dangerous’ Library RJ O’Hara Fitchburg (Mass.) Pride 1 (20), 4, 2007 | | 2007 |
| Essay-review of Valentine’s “On the Origin of Phyla” RJ O’Hara International Studies in the Philosophy of Science 21 (1), 109–112, 2007 | | 2007 |
| Essay-review of Christian’s “Maps of Time: An Introduction to Big History” RJ O’Hara International Studies in the Philosophy of Science 20 (1), 117–120, 2006 | | 2006 |
| Peabody Park RJ O’Hara University of North Carolina at Greensboro, 1999 | | 1999 |
| The history of systematics: A working bibliography, 1965–1996 RJ O’Hara SSRN 2541429, 1998 | | 1998 |
| Narrative in the historical sciences: A working interdisciplinary bibliography RJ O’Hara SSRN 2542010, 1998 | | 1998 |
| Review of Panchen’s “Classification, Evolution, and the Nature of Biology” RJ O’Hara Isis 85 (1), 182–183, 1994 | | 1994 |
| Review of Atran’s “Cognitive Foundations of Natural History: Towards an Anthropology of Science” RJ O’Hara Forest & Conservation History 37 (1), 42, 1993 | | 1993 |
| Review of Kofalk’s “No Woman Tenderfoot: Florence Merriam Bailey, Pioneer Naturalist” RJ O’Hara Archives of Natural History 18 (3), 415, 1991 | | 1991 |
| The Great Collections: Agassiz, Barbour, Bigelow, Brewster, Cabot, de Koninck, Faxon, Garman, Hagen, Thayer, Whitney R Coombs, RJ O’Hara Library of the Museum of Comparative Zoology, Harvard University, 1986 | | 1986 |
