menu at the top of the page shows the main sections of the site.
The selected item is highlighted in lighter color.
main sections are divided into chapters that are listed at the left.
some of the chapters have been divided into shorter passages which
are listed on top right corner.
magnifying glass icon at the title bar opens a search section where
you can search this site for specific words and phrases.
question mark icon opens this help section, which also includes
information about the authors and about the sources used.
the bottom right corner of some pictures there is a numeric icon,
which indicates that a sequence of pictures can be viewed by clicking
the picture with mouse.
order to view the panoramic images, the Apple QuickTime 3 must be
installed. You can get the program from the Apple
to the audio samples requires RealAudio G2 player, which can be
downloaded from the RealNetworks