* by the National Park Service* Map of Joshua Tree National Park* Geologic Travel Cuide: article by the American Geological Institute* "Keys Ranch: Where Time Stood Still", a National Park Service Teaching with Historic Places (TwHP) lesson plan* Joshua Tree National Park Bird Checklist with seasonal info.
==External links==* by the National Park Service* Map of Joshua Tree National Park* Geologic Travel Cuide: article by the American Geological Institute* "Keys Ranch: Where Time Stood Still", a National Park Service Teaching with Historic Places (TwHP) lesson plan* Joshua Tree National Park Bird Checklist with seasonal info.