SOLSTICE: An Electronic Journal of Geography and Mathematics. (Major articles are refereed; full electronic archives available) 
Figure 1a. Projection is from the north pole. 
Figure 1b. Projection is from the center of the globe. 
Figure 1c. Projection is from a point at infinity. 
Figure 2. Relationship among different perspective projection types. 
Figure 3a. C and C' are harmonic conjugates 
Figure 3b. C and C' are harmonic conjugates 
Figure 5. Animation displaying content of Harmonic Map Projection Theorem (1986). Link to a Quicktime movie (works better in some browsers than otherstry Firefox if Internet Explorer is a problem; Music [Mozart, The Magic Flute]. 
Solstice:
An Electronic Journal of Geography and Mathematics,
