All images are keyed to relevant concept and text frame.
Additional or alternative images are labeled 'x'.
All images are sized for use in a 800x600 screen (see labeled dimensions). File sizes are mostly under 100KB.
*CONDITIONS OF USE: Where file names end in '-w', they come from Wikipedia and are public domain. For others, permission has been granted for non-profit educational purposes only and for personal download use only (not to be further distributed). Please refer all colleagues to the website: