Toxicology Abstracts – Available only by subscription.

Toxics Release Inventory (TRI) – Access is freely available to all.

TOXLINE – Access is freely available to all.

TOXNET (Toxicology Data Network) – Access is freely available to all. National Library of Medicine's portal to databases on toxicology, hazardous chemicals, environmental health, and toxic releases.

TRIS (Transportation Research Information Service) – Access is freely available to all. Bibliographic database of published transportation-related research including technical reports, books, conference proceedings and journal articles. Many links go to full-text sources.

TRoPHI, Trials Register of Promoting Health Interventions – Access is freely available to all. A registry of randomized and non-randomized controlled trials of public health and health promotion interventions. TRoPHI is hosted by the Evidence for Policy and Practice Information and Coordinating Centre (EPPI-Centre).

Tropical Diseases Bulletin – Available only by subscription.

Turning Research Into Practice (TRIP) – Access is freely available to all.