- 24/7 help from a reference librarian from a Colorado library
- Colorado Historic Newspapers Collection (CHNC) currently includes 147 newspapers published in Colorado from 1859 to 1923. CHNC contains over 477,000 digitized pages.
Digital Public Library – find digitized images amassed from 40 different contributing libraries, archives and museums. Search by keyword, by geographic location or timeline.
- Shmoop—website written by educators and experts from Ph.D. and Masters programs at Stanford, Harvard, UC Berkeley (and other top universities). The vast majority of Shmoop writers have taught at the high school or college levels. Contains sections on history, poetry, literature, biographies, AP Exams and more.