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From UMich's John Wilkin via  LIBLICENSE:"Klaus is essentially right about HathiTrust, and I believe thatroughly the same thing is true for Google.  Per guidance fromMichigan's General Counsel, HathiTrust uses a default value of 140years for countries that use "life + 70" for their term of copyright.If the author's death date is known (and significant resources aregoing into determining death dates for some countries), the actualdeath date + 70 is used.   Now, or very soon, HathiTrust will be using120 years for "life + 50" countries; again, an actual death dateoverrides this default value.  All of this applies to users outside ofthe US viewing works published outside of the United States, and thedate used (e.g., 1873) changes automatically at the turn of the year."This means that there is now a good chance for suggesting worldwide opening of works by authorts who were 70 years dead! My own experiences with opening of pre-1923 volumes for US-citizen are very promising.