This page contains the links to HTS databases that exist on the web. Most of them are to HTS publications.
High-Tc Update (1986-present)
Superconductivity Paper Database from Japan (AIST and ISTEC) (pre 1997-present)
Los Alamos National Laboratory E-print server (1992-present)
Virtual Journal of Applications of Superconductivity (may allow only table of contents search, not full text retrieval without a subscription)
NIST Superconductor Materials Database (Note that this database covers 1987-1996 only)
STC short list of HTS materials and crystal structures