TY - GEN PB - Weidmannsche Buchhandlung CY - Berlin L2 - http://www.bibliotekacyfrowa.pl/Content/100212 PY - 1912 KW - actionometry of stars KW - stars of magnitude 7.5 KW - zone 0° to +20° UR - http://www.bibliotekacyfrowa.pl/dlibra/publication/edition/100212 ER -