The Oregon Encyclopedia, a partnership of Portland State University, the Oregon Council of Teachers of English, and the Oregon Historical Society, and a project of the Oregon Sesquicentennial Celebration, is a comprehensive and authoritative compendium of information about Oregon's history and culture. The Encyclopedia grows each week to include:

• Hundreds of entries and essays on Oregon subjects
• Coverage of significant people, events, places, institutions, and more, from 10,000 years ago to the present
• Essays and entries on ethnic groups and communities throughout Oregon's history
• Entries on art, architecture, literature, performing arts, music, and popular culture
• Hundreds of images, documents, and maps
• Essays that add new perspective to issues and events
• Special sections for teachers and students