Annals of the Dudley Observatory, Vol. 2 (Classic Reprint) Observatory, Dudley Innbundet / 2019 / Engelsk
Astronomical Journal, Vol. 19: April, 1898 to February, 1899, Numbers 433 456 (Classic Reprint) Observatory, Dudley Heftet / 2018 / Engelsk
Astronomical Journal, Vol. 19: April, 1898 to February, 1899, Numbers 433 456 (Classic Reprint) Observatory, Dudley Innbundet / 2018 / Engelsk
Astronomical Journal, Vol. 7: November, 1866, to March, 1888 (Classic Reprint) Observatory, Dudley Innbundet / 2018 / Engelsk
Inauguration of the Dudley Observatory, at Albany, August 28, 1856 Observatory, Dudley Heftet / 2018 / Engelsk
Astronomical Journal, Vol. 7: November, 1866, to March, 1888 (Classic Reprint) Observatory, Dudley Heftet / 2018 / Engelsk
Annals of the Dudley Observatory, Vol. 2 (Classic Reprint) Observatory, Dudley Heftet / 2019 / Engelsk
