Networked Digital Library of Theses and Dissertations (NDLTD)A collaborative effort of the NDLTD, OCLC, VTLS, and Scirus, the NDLTD Union Catalog contains more than one million records of electronic theses and dissertations. For students and researchers, the Union Catalog makes individual collections of NDLTD member institutions and consortia appear as one seamless digital library of ETDs. The NDLTD provides free resources to contribute your institution's metadata - click to learn more about the Union Catalog project.