McKinnon, Gina. 500 Essential Cult Books: The Ultimate Guide.

NY: Sterling, 2010.

I remember, years ago, being involved in an extended, entirely friendly, but nevertheless intense argument with several friends, fellow science fiction fans, about which were the “best” novels in that field. Not the most literary, nor even the best-written (which might have excluded Heinlein entirely), but the essential books that no one who considered himself a fan could have NOT read. My top choice was (probably still is) Stranger in a Strange Land.