Astronomical Journal
1st Article about Lehigh 691
Joseph B. Reynolds. "Ephemeris of Minor Planet, Lehigh (691)". The Astronomical Journal, Volume XXVI, no.622, January 30, 1911.
2nd Article about Lehigh 691
Joseph B. Reynolds. "Oppositions-ephemeris of Minor Planet Lehigh (691)". The Astronomical Journal, Volume XXVII, no.632, February 15, 1912.