Memoranda of Cooperation and Strategic Environmental Plans [Memoranda de Cooperación y Planes Estratégicos Ambientales]
Environmental agreements with Mexican states neighboring Texas: Chihuahua, Coahuila, Nuevo León, Tamaulipas
Chihuahua
Texas-Chihuahua-New Mexico Strategic Environmental Plan 1999 
(English)- Texas-Chihuahua-New Mexico Plan Estratégico Ambiental: Marco de Cooperación 1999 (español)
- Texas-Chihuahua Memorandum of Cooperation 2019 (English & español)
Coahuila
- Texas-Coahuila Strategic Environmental Plan 1998 (English)
- Texas-Coahuila Plan Estratégico Ambiental: Marco de Cooperación 1998 (español)
- Texas-Coahuila Memorandum of Cooperation 2013 (English & español)
Nuevo León
- Texas-Nuevo León Strategic Environmental Plan 1997 (English)
- Texas-Nuevo León Strategic Environmental Plan 2005 (English)
- Texas-Nuevo León Plan Estratégico Ambiental: Marco de Cooperación 2005 (español)
- Texas-Nuevo León Memorandum of Cooperation 2010 (English)