The beginning and end of a Jesuit observatory (1841-1972)Francis J. Heyden · First published 1972Open the Tome
The beginning and end of a Jesuit observatory, 1841-1972Francis J. Heyden · First published 1970Open the Tome
Research directed toward geodetic measurements by observations of solar eclipsesFrancis J. Heyden · First published 1961Open the Tome
