Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken
"Part IV." Part of a CIHM set. For individual microfiches in this set see CIHM microfiche nos. 26621 to 26625 Original issued in series: Smithsonian miscellaneous collections ; 219 Includes index Filmed from a copy of the original publication held by the Library, Geological Survey of Canada 43
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