Index of Oil-Shale and Shale-Oil Patents, 1946-56: A Supplement to Bulletins 467 and 468: (In Three Parts) [Part 3]. European Patents and Classification
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Index of Oil-Shale and Shale-Oil Patents, 1946-56: A Supplement to Bulletins 467 and 468: (In Three Parts) [Part 3]. European Patents and Classification, report, 1959; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12729/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.