Description
Published:Began with no. 115 in 1975.
Item Description:Description based on: No. 130 (Jan. 1-Dec. 31, 1987).
Physical Description:v. : ill. ; 28 cm.
Beginning 1997, available also online via the World Wide Web in PDF and HTML file formats.
Publication Frequency:Annual, <1977->
ISSN:0163-9218
0025-4827