"Developed as part of a joint effort between the U.S. Environmental Protection Agency and state and local air pollution control agencies"--Cover.
Shipping list no.: 98-0973-M.
"April 1998"--Prelim. p.
"May 1998"--Cover.
Microfiche. [Washington, D.C.] : Supt. of Docs., U.S. G.P.O., 1998 3 microfiches : negative.