Title	Publication Date	Language	Citations
Recovery of the Andromedids	1959/01/01
Nineteen determinations of stellar parallax	1932/06/01
Galaxies as references in construction of star catalogues	1967/06/01
On the rings of Saturn
Filar-micrometer observations of comet 1889b
Observations of (433) Eros
Reddening Study of a Bright High Galactic Latitude Nebula: LBN 434	1997/04/01
On the helium content of the early-type stars.	1951/04/01
Erratum - a Grid for the Calculation of Log/g and T/eff from Stromgren Four-Color Indices	1980/04/01
On the correction of the elements of (1) Ceres, with ephemeris for the opposition of 1858
Observations of comet 1896a
Request for unpublished observations of Algol
Erratum [New planet]
A second Wolf-Rayet eclipsing variable.	1944/08/01
Observations of the star Krueger 60	1903/09/01
Comet 1889d
New Infrared Observations with Stratoscope II.	1964/01/01
Mr. Stockwell on the theory of tidal friction	1906/04/01
Observations of comet 1904e	1905/03/01
Propagation of Energetic Solar Particles.	1962/03/01
On the employment of the theorem "Small angles are proportional to their sines"
A new traveling wire micrometer for an equatorial	1913/01/01
A comparison of present and earlier Allegheny parallaxes.	1950/01/01
The eclipsing variable TW CANCRI	1946/11/01
Parallax and mass ratio of 10 UMa from photographs taken with the 24-inch Sproul refractor.	1959/11/01
Abstracts of papers presented at the Seventy-fifth Meeting of the American Astronomical Society	1947/02/01
Occultation of Jupiter, 1889 September 3
Sproul Observatory Swarthmore Pennsylvania.	1967/11/01
Observations of Winnecke's comet
Fourth satellite of Jupiter