The Wikipedia article (http://en.wikipedia.org/wiki/Internet_Archive) says: "It has a staff of 200, most of whom are book scanners in its book scanning centers. Its main office in San Francisco houses about 30 employees." The site has a list of employees with descriptions: http://www.archive.org/about/bios.php

A blog post about its scanning centers: https://ianews.wordpress.com/2011/09/17/3-million-texts-for-... "More than 100 people digitize books in Internet Archive scanning centers in 27 libraries in 6 countries. At 10 cents a page, we are bringing over 1,000 new books online every day."

Ah! I didn't know they were involved in book scanning as well. That makes sense. Thank you.