Produzierendes Gewerbe.
Reihe 6.4,
Stromerzeugungsanlagen der Betriebe im Bergbau und im Verarbeitenden Gewerbe.

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Item Link Original Source
Limited (search only)   1976-81 University of Minnesota
Limited (search only)   1976-91 University of California
Limited (search only)   2001 University of California
Limited (search only)   2002 University of California