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At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
books.google.com - Anyone with a computer has heard of viruses, had to deal with several, and has been struggling with spam, spyware, and disk crashes. This book is intended as a starting point for those familiar with basic concepts of computers and computations and who would like to extend their knowledge into the realm...https://books.google.com/books/about/Foundations_of_Computer_Security.html?id=d2RNQNUWPIkC&utm_source=gb-gplus-shareFoundations of Computer Security