See, Thomas Jefferson Jackson, 1866- **F.5142.63 Die Entwickelung der Doppelstern-Systeme. Inaugural-Disserta- tion... Berlin... 1892.
— Berlin, Friedlander. 1893. (6), 60, (2) pp. Illus. Charts. Diagrams. Tables, 29 cm., in 4s.
This card was printed at the Boston oS Public Library, November 23, 1032.
D13c6 — Stars. Double.