Mendelian Inheritance in Man (MIM), a computerized catalogue of human genetic disorders authored and maintained by cardiologist and medical genetics pioneer Victor A. McKusick, played a major part in demarcating between a novel biomedical science and the eugenic projects of racial betterment which existed prior to its emergence. Nonetheless, it built upon prior efforts to systematize genetic knowledge tied to individuals and institutions invested in eugenics. By unpacking the process of digitizing a homespun cataloguing project and charting its development into an online database, this article aims to illuminate how the institution-building efforts of one individual created an 'information order' for accessing genetic information that tacitly shaped the norms and priorities of the field toward the pursuit of specific genes associated with discernible genetic disorders. This was not by design, but rather arose through negotiation with the catalogue's users; it accommodated further changes as biomedical research displaced the Mendelian paradigm. While great effort was expended toward making sequence data available to investigators during the Human Genome Project, MIM was largely taken for granted as a 'legacy system', McKusick's own labour of love. Drawing on recent histories of biomedical data, the article suggests that the bibliographical work of curation and translation is a central feature of value production in the life sciences meriting attention in its own right.