Below, frequently used trade data. For more, see this page.
Below, top resources for treaties.
Treaties in Force (TIF)
An official government publication which provides an index to treaties currently in force to which the U.S. is a party.
Treaties and Other Interational Agreements of the United States of America, 1776-1949 (Bevans)
CC Gov Docs S 9.12/2 v.1-13
The definitive publication of treaties to which the U.S. was a party from 1776-1949. Volume 13 provides an index by subject and country. Often called Bevans after its author, Charles Bevans.