For some reason this first contact book came to mind last night:
http://www.amazon.com/Alien-Years-Ro.../dp/006105111X
http://www.majipoor.com/work.php?id=20
http://books.google.com/books?id=d6-...page&q&f=false
Out of print, but plenty of used copies available. No official ebook, it is "out there."