Here is a description of the categories and the sort of
sites that they contain:
Utilities: [2] Specialist bookstores and specific books on utilities.
Electricity: [2] Specialist bookstores and specific books on electricity.
Electrochemical: [2] Specialist bookstores and specific books on electrochemical energy.
Nuclear: [2] Specialist bookstores and specific books on nuclear energy.
Petroleum: [1] Specialist bookstores and specific books on petroleum energy.
Renewable: [2] Specialist bookstores and specific books on renewable energy.
Energy efficiency: [2] Specialist bookstores and specific books on energy efficiency.
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