THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS 25 Birch Street, Cambridge, MA 02138 USA BITNET: aavso@cfa8 SPAN: nssdca::cfa8::aavso Tel. 617-354-0484 FAX 617-354-0665
AAVSO ALERT NOTICE 142 (April 19, 1991)
NOVA OPHIUCHI 1991
