The Open Book page image presentation framework is
not designed to replace printed books. Rather, it is a free, browsable,
nonproprietary, fully and deeply searchable version of the publication
which we can inexpensively and quickly produce to make the material
available worldwide.
For most effective printing, use the
"printable PDF page" link available on each OpenBook page's tool block.
The 300 x 150 dpi PDF linked to it is printable on your local printer.
Copyright 2001, the National Academies Press. Please use
the content on the page image as the authoritative version. HTML may have
misrepresentations or apparent omissions. Page display interface
copyright 1999 and 2003, the National Academies Press.