On this day: sources

The historical archive used in previous Bird Dog editions has one entry for each calendar date. Dates follow America/Denver time. Source and license details remain available here.

Historical entries are selected from Wikipedia contributors through the wikipedia-onthisday dataset. Each entry links to its source date page. Wikipedia-derived text is available under Creative Commons Attribution-ShareAlike 4.0. The selection is also available under that license. No endorsement is implied.

The September 11 entry is original commemorative wording with a link to the National September 11 Memorial & Museum. The collection is edited for selection and presentation; it is not an exhaustive history of each day.