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The CBP has a list of airports with APC kiosks.
Houston George Bush Intercontinental Airport (IAH)
Note that they are not necessarily at all terminals though.
U.S. or Canadian citizens, U.S. green card holders, legal permanent residents, ESTA and visa-waiver holders may use one of the 50 self-service kiosks when arriving at IAH on international flights. All eligible foreign visitors must have entered the U.S. at least once prior.