http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
volumes in : illustrations, diagrams ; 22-29 cm.
Publication suspended Jan. 1951-Nov. 1957.
Issues for Sept. 1945-May 1949 and Dec. 1957-June 1961 published as a section of Power engineering (formerly Power plant engineering and Power generation) The sections are unnumbered but constitute v. 1-5, no. 4 and 10?-13.