Description
Published:Ceased publication with v. 34, no. 1 (Mar. 1994)?
Item Description:Description based on: Volume 19, number 1 (Feb. 28, 1979); title from cover.
Physical Description:volumes ; 21 x 27 cm.
Issued also on microfiche, Supt. of Docs. class no.: NAS 1.15.
Distributed to depository libraries in microfiche, Supt. of Docs. class no.: NAS 1.40.
Publication Frequency:Quarterly, <1987- >