2014 Texas Natural Resources Code > Title 4 > Chapter 133 > Subchapter D – Safety and Certification

2011 Texas Natural Resources Code > Title 4 > Chapter 133 > Subchapter D – Safety and Certification

2009 Texas Natural Resources Code > Title 4 > Chapter 133 > Subchapter D – Safety and Certification

2008 Texas Codes > Natural Resources Code > Title 4 > Chapter 133 > Subchapter D – Safety And Certification