Over my usage of the site i have noticed many users specifically asking for references to literature where some physical property is listed for a particular compound. Many a times i have also seen multiple sites giving different values for the same property of a particular substance.
I tried searching the meta for any such posts but couldn't find any, hence I am asking this question.
I'd say this is a duplicate of my previous request for such a canonical compilation: “List of data sources” question. But I think it may be a useful opportunity to reopen the discussion on this topic. I stand by my opinion that it would be beneficial to have one such post. It would also be a useful place to mention that values may not always agree with each other perfectly (due to experimental inaccuracies, etc.) which is something that many new (and experienced) chemists can forget.