H.C. Russell. Measures of double star A. Centauri at Sydney Observatory, (2 ff.), 1870-1877 Unit ID: 11 Date: 1870/1877
H. C. Russell. Sketches of nebulae about Etna Argus observed at Sydney, (5 ff.), 05 September 1873-05 September 1873 Unit ID: 4 Date: 1873-09-05/1873-09-05