Here's some quick links

NASA ADS Search Page: This is great for finding papers SIMBAD Astronomical Database: Start here to find astronomical objects Vizier Catalog Service: Great for finding catalogs containing certain characteristics or particular objects Harris's Globular Cluster Catalog: The end all and be all of general data about globular clusters. The Cerro Tololo Observatory Website: The starting point for info on any of the telescopes at the Cerro Tololo Chilean Website