I know the more general question has been asked here:
Open Database of Phase Diagrams?
And this has a link to slightly more specific question with more answers:
Phase diagram for first 10 elements
And this in turn has led me to Wolfram Alpha which has the best answer I can find so far:
http://www.wolframalpha.com/input/?i=ethanol+phase+diagram
But it's still pretty poor compared to water:
https://commons.wikimedia.org/wiki/File:Phase_diagram_of_water.svg
Are good phase diagrams really such a rare occurrence? What reference standard exists for industry? Is there a famous book people buy that has all this data in it?