Description
Published:Began with: Vol. 1, no. 1 (July 1960); ceased with: Vol. 69, no. 12 (Dec. 2012).
Item Description:Electronic resource.
Physical Description:Also issued in print and 35mm microfilm (v.1- ), 16mm microfilm (v.13- ), and microfiche (v.23- ).
Publication Frequency:Monthly
Format:Mode of access: World Wide Web.
ISSN:1538-3687
0003-9942
2168-6157