Proceedings of the South London Entomological & Natural History Society - South London Entomological; Natural History Society (South London Entomological and Natural history Society, 1932)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1904)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1907)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1937)

Proceedings of the Washington Academy of Sciences - Washington Academy of Sciences (Washington, D.C.) (Washington Academy of Sciences, 1900)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1883)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1910)

Proceedings of the Zoological Society of London - Zoological Society of London. (Academic Press, [etc.], 1911)

Procès-verbaux - Société Linnéenne de Bordeaux. (1933)

Prodromus systematis Lepidopterorum : versuch einer systematischen Anordnung der Schmetterlinge - Heinrich-Schäffer. (Zoologisch-Mineralogischer Verein, 1864, 1864)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1874)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1875)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1878)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1877)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1890)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1889)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1901)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1900)

Psyche - Cambridge Entomological Club. (Cambridge Entomological Club, 1925)

Rare irises and peonies - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Robert Wayman, 1934)

The Record of zoological literature (J. van Voorst, 1866)

The Record of zoological literature (J. van Voorst, 1869)

Repertorium entomologicum - Deutsche Entomologische Gesellschaft. (Friedländer & Sohn, 1924)

Report - British Columbia Provincial Museum. (1914)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1914)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1915)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1943)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1948)

Report - British Columbia Provincial Museum. (Printed by W.H. Cullin, 1944)

Report for the year - British Columbia Provincial Museum - British Columbia Provincial Museum. (Printed by A. Sutton [etc.], for the Queen, 1913)

Report for the year - British Columbia Provincial Museum - British Columbia Provincial Museum. (Printed by A. Sutton [etc.], for the Queen, 1914)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1926)

Report of the Canadian Arctic Expedition 1913-18 (F. A. Acland, Printer to the King, 1919)

Report of the Canadian Arctic Expedition 1913-18 (F. A. Acland, Printer to the King, 1913)

Report of the Provincial Museum of Natural History - British Columbia Provincial Museum. (Provincial Museum, King's Printer for British Columbia, 1912)

Report of the State Entomologist on injurious and other insects of the state of New York - Felt, Ephraim Porter, 1868 -1943 (Weed, Parsons and Co.; University of the State of New York, 1900)

Report of the State Entomologist on injurious and other insects of the state of New York - Felt, Ephraim Porter, 1868 -1943 (Weed, Parsons and Co.; University of the State of New York, 1904)

Report of the State Entomologist on injurious and other insects of the state of New York - Felt, Ephraim Porter, 1868 -1943 (Weed, Parsons and Co.; University of the State of New York, 1907)

Report on the geology and resources of the region in the vicinity of the forty-ninth parallel, from the Lake of the Woods to the Rocky Mountains - Dawson, George Mercer, 1849 -1901 (Dawson, 1875)

Report upon United States Geographical surveys west of the one hundredth meridian - Geographical Surveys West of the 100th Meridian (U.S.) (G.P.O, 1875)

Reports (King's Printer, 1917)

Revista chilena de historia natural - Museo de Historia Natural de Valparaíso (Valparaíso, Chile) (Litografia e Impr. Industrial (F. Peters), 1897)

Revista chilena de historia natural - Museo de Historia Natural de Valparaíso (Valparaíso, Chile) (Litografia e Impr. Industrial (F. Peters), 1900)

Revista chilena de historia natural - Museo de Historia Natural de Valparaíso (Valparaíso, Chile) (Litografia e Impr. Industrial (F. Peters), 1903)

Revista chilena de historia natural - Museo de Historia Natural de Valparaíso (Valparaíso, Chile) (Litografia e Impr. Industrial (F. Peters), 1921)

Rhopalocera æthiopica; die Tagfalter des æthiopischen Faunengebietes, eine systematisch-geographische Studie - Aurivillius, Chr. (Christopher), 1853 -1928 (Kungl. Boktryckeriet, P.A. Norstedt & Sönner, 1898)

Rhopalocera Europæ, descripta et delineata = The butterflies of Europe, described and figured - Lang, Henry C. (L. Reeve, 1884)

Russkoe entomologicheskoe obozrenie = Revue russe d'entomologie - Russkoe entomologicheskoe obshchestvo (Russkoe entomologicheskoe obshchestvo, 1914)

Russkoe entomologicheskoe obozrenie = Revue russe d'entomologie - Russkoe entomologicheskoe obshchestvo (Russkoe entomologicheskoe obshchestvo, 1915)

Russkoe entomologicheskoe obozrenie = Revue russe d'entomologie - Russkoe entomologicheskoe obshchestvo (Russkoe entomologicheskoe obshchestvo, 1926)

The Sam Carpenter Gardens [iris catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Sam Carpenter Gardens, 1931)

Die Schmetterlinge der Schweiz - Müller-Rutz, J. (K.J. Wyss, 1911)

Die Schmetterlinge der Schweiz - Müller-Rutz, J. (K.J. Wyss, 1914)

Die Schmetterlinge Europas - Hofmann, Ernst, 1837 -1892 (E. Schweizerbart, 1908)

Die Schmetterlinge Europas - Hofmann, Ernst, 1837 -1892 (E. Schweizerbart, 1910)

Science - American Association for the Advancement of Science. ([s.n.], 1900)

Science-gossip (Simpkin Marshall, Hamilton, Kent & Co, 1896)

Science-gossip (Simpkin Marshall, Hamilton, Kent & Co, 1899)

Science series / Los Angeles County Museum - Campbell, Kenneth E. Jr. (Kenneth Eugene), 1943 - (Natural History Museum of Los Angeles County, 1955)

The Scottish naturalist (T. Buncle & Co. [etc.], 1919)

Select irises - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Indian Spring Farms, Inc, 1928)

sheng wu ming cheng he sheng wu xue shu yu de ci yuan - Jaeger, Edmund C. (Edmund Carroll) 1887 -1983 (ke xue chu ban she, 1979)

Sierra Club bulletin - Sierra Club. (Sierra Club, 1913)

Societas entomologica - International Entomological Society. (A. Kernan [etc.], 1900)

Societas entomologica - International Entomological Society. (A. Kernan [etc.], 1902)

Societas entomologica - International Entomological Society. (A. Kernan [etc.], 1922)

Sow Salzer's seeds : 1868-1932 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (John A. Salzer Seed Co, 1932)

The standard natural history - Kingsley, J. S. (John Sterling), 1854 -1929 (S.E. Cassino and company, 1886)

Stock reduction sale : iris of quality - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Iris Fields, 1929)

Supplement to A catalogue/checklist of the butterflies of America, north of Mexico - Miller, Lee D. (Lepidopterists' Society, 1989)

Supplementary catalogue of the Library of the Entomological Society of London - Champion, G. C. (George Charles) 1851 -1927 (The Society, 1900)

Surplus iris sale : season 1930 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (F.X. Schreiner, 1930)

A survey and record of Woolwich and West Kent containing descriptions and records, brought up-to-date, of geology, botany, zoology, archaeology and industries of the district, with a brief photographic commentary, in commemoration of the 12th Annual Congress, 1907, of the South Eastern Union of Scientific Societies - Grinling, C. H. (Labour Representation Print. Co, 1909)

A synonymic catalogue of diurnal Lepidoptera - Kirby, W. F. (William Forsell), 1844 -1912 (J. Van Voorst, 1871)

A synonymic catalogue of diurnal Lepidoptera Supplement, March, 1871-June, 1877 - Kirby, W. F. (William Forsell), 1844 -1912 (J. Van Voorst, 1877)