Columbia subject headings:
Harvard subject headings:
Electric power-plants--Switzerland--Graubünden--History.
Electrification--Switzerland--Graubünden--History.
Hydroelectric power plants--Economic aspects--Switzerland--Graubünden.
Hydroelectric power plants--Government policy--Switzerland--Graubünden.
Hydroelectric power plants--Law and legislation--Switzerland--Graubünden.
Hydroelectric power plants--Political aspects--Switzerland--Graubünden.
Hydroelectric power plants--Switzerland--Graubünden--History.
Princeton subject headings:
Dams--Switzerland--Graubünden--History.
Electric industries--Switzerland--Graubünden--History.