Explorer Maps with System Numbers
Below are Explorer Maps with System Numbers as well as attached PDF's of each System.
System 1A - Port Neches to Port Arthur:

System 2 - Houston to Glenpool (28"):

System 2A & B - Port Arthur to Houston (28"):

System 3 - Greenville to Fort Worth (12"):

System 4 - Glenpool to Wood River (24"):

System 4A - Wood River to Hammond (24"):

System 5 - Wood River to St. Louis:

System 10 & 10A - Houston to Arlington (10"):

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