Following the steps of previous projects such as EuDML, Mathdoc is launching its Digital Mathematics Library. Based on a reliable infrastructure made for Numdam, learning from previous projects, and relying on a network of institutions we trust, we aim to push the ball further for accessing mathematical content online. We focus for a start on the aggregation part, aiming to reach a critical mass of mathematical content by harvesting various sources: OJS instances, preprint repositories , and locals DMLs. We thus build a database of mathematical documents, linking back to the source's website for accessing content.