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General Research Division, The New York Public Library. "Land Molluscs 1, 2. Varieties of Helix hortensis; 3. Agriolimax agrestis; 4. Buliminus moutanus; 5. Limax maximus; 6, 7. Helix menoralis; 8, 9. Helix personta; 10. Helix pomatia; 11, 12. Clausilia ventricosa; 13. Cyclostoma elegans; 14, 15. Varieties of Arion empiricorum." The New York Public Library Digital Collections. 1800 - 1899. https://digitalcollections.nypl.org/items/510d47da-32d3-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Land Molluscs 1, 2. Varieties of Helix hortensis; 3. Agriolimax agrestis; 4. Buliminus moutanus; 5. Limax maximus; 6, 7. Helix menoralis; 8, 9. Helix personta; 10. Helix pomatia; 11, 12. Clausilia ventricosa; 13. Cyclostoma elegans; 14, 15. Varieties of Arion empiricorum." New York Public Library Digital Collections. Accessed January 29, 2025. https://digitalcollections.nypl.org/items/510d47da-32d3-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1800 - 1899). Land Molluscs 1, 2. Varieties of Helix hortensis; 3. Agriolimax agrestis; 4. Buliminus moutanus; 5. Limax maximus; 6, 7. Helix menoralis; 8, 9. Helix personta; 10. Helix pomatia; 11, 12. Clausilia ventricosa; 13. Cyclostoma elegans; 14, 15. Varieties of Arion empiricorum. Retrieved from https://digitalcollections.nypl.org/items/510d47da-32d3-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-32d3-a3d9-e040-e00a18064a99 | title=
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Land Molluscs 1, 2. Varieties of Helix hortensis; 3. Agriolimax agrestis; 4. Buliminus moutanus; 5. Limax maximus; 6, 7. Helix menoralis; 8, 9. Helix personta; 10. Helix pomatia; 11, 12. Clausilia ventricosa; 13. Cyclostoma elegans; 14, 15. Varieties of Arion empiricorum., (1800 - 1899)
|author=Digital Collections, The New York Public Library |accessdate=January 29, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>