ABSTRACT
Overview 28
Meanings through time 29
Prehistory 29
Classical and early 33
From Vikings to United States 36
The Age of Steam 38
Twentieth century 42
Ideas for further study or work 51
Reading 51
Overview 28
Meanings through time 29
Prehistory 29
Classical and early 33
From Vikings to United States 36
The Age of Steam 38
Twentieth century 42
Ideas for further study or work 51
Reading 51