Columbia subject headings:
Electric power production--Italy--Congresses.
Electric power production--Spain--Congresses.
Industrial archaeology--Italy--Congresses.
Industrial archaeology--Spain--Congresses.
Industrial buildings--Italy--Congresses.
Industrial buildings--Spain--Congresses.
Harvard subject headings:
Electric power production--Italy--Congresses.
Electric power production--Spain--Congresses.
Industrial archaeology--Italy--Congresses.
Industrial archaeology--Spain--Congresses.
Industrial buildings--Italy--Congresses.
Industrial buildings--Spain--Congresses.
Princeton subject headings:
Electric power production--Italy--Congresses.
Electric power production--Spain--Congresses.
Industrial archaeology--Italy--Congresses.
Industrial archaeology--Spain--Congresses.
Industrial buildings--Italy--Congresses.
Industrial buildings--Spain--Congresses.