(links will open a new tab/window)

Wikipedia hand axe

Journal of Lithic Studies

Earliest Use of Ground-edge Axes   (Australian Archaeology)

Tom Dillehay's perseverance    (The Scientist - 1990)

The Evolution of Stone Tools - Beyond Grahame Clark's Lithic Modes   (ThoughtCo.)

The Stick is an Unsung Hero of Human Evolution    (Nautilus)

Finding North America's Lost Medieval City    (Ars Technica)

Most archaeologists think the first Americans arrived by boat. Now, they're beginning to prove it.   (Science)

Archaeologica.org 

Don's Maps

The Importance of Amateur Archaeologists

 Museum of the Stone Age

On Acheulean hand axes in America

A Classification System for Ground Stone Tools from the Prehistoric Levant

What Happens When an Archaeologist Challenges Mainstream Scientific Thinking?    (Smithsonian)

"The important thing is to not stop questioning.  Curiosity has its own reason for existing."    Albert Einstein