Denver Earth Resources Library


The Denver Earth Resources Library (DERL), founded in 1986, is the geological information center of the West, presenting unique source-document and first generation files which cannot be found anywhere else.
DER Library Entrance

Our data collection is the largest in the U.S., with a concentration on the Rockies, Mid-Continent, and Illinois Basin, and includes current scout cards and IHS weekly “Drilling Wire” reports. Partial coverage is available throughout the entire US, including Alaska, southeastern States, and Texas.

The collection of historical data, dating back from the 1800s, includes entire well files with:

  • well logs in hard-copy form, fiche, and microfilm
  • geological reports
  • mudlogs
  • core and DST reports
  • lithological logs
  • Pomco land maps
Denver Earth Resource Library

“I can’t find any bones at DERL, but it’s a great place to look for oil and gas!” – Ollie