Jerry
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Welcome! (start here)
Types of Horse
Irish Hobby
Hobby Horses (costumed characters)
Hobbies (from hobby-horses)
My Hobbies
Technology (1829)
Tech Thinkers
Historians of Science
Erwin Hiebert
Parents
Historians of Science
Children
The Helmholtz Legacy in Physiological Acoustics (2012 pdf)