The World History of Science Online (WHSO) is a project of the Commission on Bibliography and Documentation (CBD) of the International Union for History and Philosophy of Science, Division of History of Science and Technology. It had its genesis in 2003 as a primary focus and public output of the CBD but it would be reasonable to say that for the last ten years it has struggled to define its purpose. Professor Rod Home, a former President of the CBD described one of the key roles of the commission the creation of a international catalogue of bibliographies. Early attempts to consider a merging of national bibliographies proved both technically and informatically unachievable and this remains the case. From a cultural and social informatic perspective the very notion of creating universal catalogues remains problematic. However, this does not lessen the need for information services to aid, foster growth, and bring productivity gains to the study of history of science and technology. Although funding has been limited the WHSO exists as a public knowledge web resource built to principles geared to underpin sustainable and resilient web-based scholarly information services. The underlying informatics of the resource utilise an open and extensible object-oriented structure that enables entities (people, organisations, events, places, cultural artefacts and concepts) to be registered and then interconnected using defined relationships creating what some have described as an epistemic web or network. A key to the success of projects that have used this approach has been the systematic linking of entities to the evidential sources (archives, records and publications) that are testimony to their existence and the activities they undertook. In 2012, Stephen Weldon presented a paper in Athens that took as its starting point the history of the history of science and in particular the work of George Sarton and the creation of the ISIS bibliography in 1913. What Weldon identified was that the key aspect of WHSO that was lacking was that it had not attempted, in a systematic and concerted way, to map the historical fabric that supports and provides meaning to the bibliographic and archival work in this history of science and technology. This paper will explore the eco-historical niche that is now being mapped out. It will examine, and present in visualisations, the types of entities and types of relationships that are necessary to make this historical space navigable.