Imprint varies: Washington, D.C., <1978-Oct. 1993>; Arlington, VA, <Dec. 1993->
Some v. distributed to depository libraries in microfiche, 1991-1996.
Description based on: Vol. 6, no. 4 (Dec. 1978); title from caption.
Issued by: National Science Foundation, Office of Legislative and Public Affairs, <Sept. 1997->
Ceased in paper format only; continued by an online version.