Discourses of the popes from Pius XI to John Paul II to the Pontifical Academy of Sciences, 1936-1986. 

 - Vatican City  Pontificia Academia Scientiarum  c1986. 
 - x, 201 p.  ill.  24 cm. 
 - Pontificiae Academiae Scientiarum scripta varia  66 .
<br/><br/> "English version edited by Fr. Paul Haffner"--Title page verso. 
<br/><br/><label>ISBN: </label>8877610069 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Religion and science<br/>Popes--Voyages.