Agriculture, screwworm eradication : agreement between the United States of America and Mexico, amending the agreement of August 28, 1972, as amended, effected by exchange of notes signed at Mexico October 19 and December 7, 1990.
Washington, D.C. : Dept. of State : For sale by the Supt. of Docs., U.S. G.P.O., [1998?]