Microfiche. <Mar. 1988>-1994. [Washington, D.C.] : Supt. of Docs., U.S. G.P.O. microfiches : negative.
Continued by online publication with same title, available via the Internet from http://h2o.usgs.gov/nwc/NWC/html/TOC.html (current issue available at http://h2o.usgs.gov/nwc/NWC/html/NWC.html).