Learn more about subterranean termites in these two articles:
The Texas Agricultural Extensive Service of the Texas A&M University System includes an excellent and heavily illustrated article about the geographic distribution of termites, their biology, reproductive cycle and their colonies. The drawings that illustrate the differences between ants and termites can help you with identification. The damage termites do is fully illustrated and the check lists of where to check for termite damage inside or outside are extensive. Prevention and chemical management is also discussed.
The Virginia Cooperative Extension offers Publication Number 444-500 which includes detailed information about the variety of termiticides, including liquid applications, repellent and non-repellent termiticides, baits and professional bating systems. The article includes with a table to help clarify how the various termiticides work, brand names and cost, as well as advantages and disadvantages of each.