The scientific heritage held in the National Institute for Astrophysics (INAF), made up of rare and modern books, instruments and archival documents, spanning from the 15th to the early 20th century, marks the milestones in the history of astronomy in Italy. To diffuse the information on this patrimony, the Libraries and Historical Archives Service and the Museums Service of INAF have developed a project aimed at creating a single web portal: Polvere di stelle. I beni culturali dell’astronomia italiana (Stardust. The cultural heritage of the Italian astronomy). This portal searches for data coming from the libraries, the instruments collections and the historical archives, regarding the heritage of the Italian Observatories. The BID (Books, Instruments, Documents) of the project is the creation of a multimedia web facility which allows the public to make simultaneous searches on the three different types of materials.