Today while composing my FERC scoping comment, I was going through some links I have been collecting over the course of the past several months. While the general Bi-National Agreement is still available on-line, the Joint Statement on Cooperative Action that specifically pertains to conservation of the Rio Grande/Rio Bravo region seems to have mysteriously disappeared from the Department of the Interior Website.
Here is the old link to it: https://www.doi.gov/news/pressreleases/loader.cfm?csModule=security/getfile&pageid=263577
Here is the broken link again on the DOI's own press release page announcing the "Cooperative Action for Conservation in the Big Bend/Rio Bravo Region": https://www.doi.gov/news/pressreleases/US-Mexico-Announce-Binational-Cooperative-Conservation-Action-Plan
Fortunately, I was able to salvage a copy of it. Here is the document that was once housed at the above (now defunct) link: