W. GAERTNER & CO., 1905b

Portable equatorial telescope fitted with driving clock : november 1905 / W. Gaertner & Co., astronomical,
physical and physiological apparatus, 5347-5349 Lake Avenue, Chicago. – [S.l. : S.n.], 1905. – [4] p. : ill. ;
23 cm.
Testo in inglese.