The document discusses two digital library projects - Botanicus and the Biodiversity Heritage Library (BHL) - that are working to digitize important historical works in taxonomy and systematics. Botanicus has digitized over 2,400 volumes and 1 million pages so far. BHL has digitized nearly 24,000 volumes and 10 million pages in collaboration with various natural history institutions and libraries. Both projects aim to make this scholarly biodiversity literature freely available online to support research.