Nuevo León Civil Registration
For years for which civil birth, marriage, & death records are not microfilmed, you may need to request a copy of the desired record from the Office of the Civil Register in Nuevo León. It's address and telephone number are:
Washington y Dr. Coss, Monterrey, Nuevo León. Teléfonos: 2020-9800, 2020-9802 y 2020-9837
More information is available  which is the official government website for Nuevo León.