get the book:
require 'open-uri';(1..48).to_a.each{|x| open('http://www.fbbook.com/promo/mashable/read.php?p='+x.to_s){|u| File.open("page_#{x}.html","w"){|f|f.puts u.readlines}}}
require 'open-uri';(1..48).to_a.each{|x| open('http://www.fbbook.com/promo/mashable/read.php?p='+x.to_s){|u| File.open("page_#{x}.html","w"){|f|f.puts u.readlines}}}
wget -r can probably do the same thing and is easier.