This paper reports on an Old Dominion University (Virginia) and NASA (National Aeronautics and Space Administration) Langley Research Center project, NCSTRL+, a unified, canonical digital library (DL) for educational, scientific, and technical information (STI). NCSTRL+ is based on the Networked Computer Science Technical Report Library (NCSTRL), a World Wide Web accessible DL that provides access to over 100 university departments and laboratories. The Dienst protocol, the protocol underlying NCSTRL, has been extended to provide the ability to "cluster" independent collections into a logically centralized DL based upon subject category classification, type of organization, and genres of material. The concept of "buckets" provides a mechanism for publishing and managing logically linked entities with multiple data formats. The NCSTRL+ prototype DL contains the holdings of NCSTRL and the NASA Technical Report Server (NTRS). The prototype demonstrates the feasibility of publishing into a multi-cluster DL, searching across clusters, and storing and presenting buckets of information. Three figures illustrate the bucket architecture, the author tool, and the fielded search screen of NCSTRL+. Contains 14 references. (Author/DLS)