MathSciNet is a database of reviews, abstracts and bibliographic information for much of the mathematical sciences literature. Over 125,000 new items and 90,000 reviews are added each year. MathSciNet contains over 3.6 million items and over 2.3 million direct links to original articles. Bibliographic data from retrodigitized articles dates back to the early 1800s. Reference lists are collected and matched internally from approximately 550 journals, and citation data for journals, authors, articles and reviews is provided. This web of citations allows users to track the history and influence of research publications in the mathematical sciences.