1. https://kcm.nku.edu/knp/includes/activity_documents/printables/printables_1130.3Ni.pdf 2. https://s3.amazonaws.com/hudsonalpha/wp-content/uploads/2020/08/27160011/Alien-DNA.pdf 3. https://www.nature.com/articles/hdy197849.pdf 4. https://www.orings-online.net/documents/manuals/alien/Alien-Independence-Manual.pdf 5. https://vixra.org/pdf/2406.0103v1.pdf 6. https://humanresources.columbia.edu/sites/default/files/content/Prof%20Dev/Aliens%20Have%20Landed%20Team%20Building.pdf 7. https://pbmanuals.com/downloads/151_Alien_Alien_Remains_Manual_ENG.pdf 8. https://oceanexplorer.noaa.gov/edu/lessonplans/aliens.pdf 9. https://digitalcommons.chapman.edu/cgi/viewcontent.cgi?article=1002&context=sociology_articles 10. https://www.uaf.edu/museum/education/educators/heliophysics-aurora-outre/activities/pdfs/Imagining-Life-Activity.pdf 11. https://digital.csic.es/bitstream/10261/157118/3/2017-Molecular_Breeding-lola.pdf 12. https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1439-0523.2004.00971.x 13. https://www.sciencedirect.com/science/article/pii/S1878029611007353/pdf?md5=4fd5c8394a3dd55f24a18e581b911729&pid=1-s2.0-S1878029611007353-main.pdf 14. https://www.nasa.gov/wp-content/uploads/2015/01/Archaeology_Anthropology_and_Interstellar_Communication_TAGGED.pdf 15. https://link.springer.com/content/pdf/10.1007/BF00215726.pdf 16. https://molcyt.org/wp-content/uploads/2016/02/n_ali_et-al-2016-multiple-alien-introgressions-in-wheat.pdf 17. https://www.flyingfrog.net/conquestofplanetearth/pdf/COPA_Rulebook_WEB.pdf 18. https://academicworks.cuny.edu/cgi/viewcontent.cgi?article=1000&context=me_pubs 19. https://www.orings-online.net/documents/manuals/alien/Deception_Manual.pdf 20. https://apsjournals.apsnet.org/doi/pdf/10.1094/PDIS-01-19-0160-RE 21. http://vmpincel.ou.edu/posters/EdGuidePDFs/PrairieRivers_edguide_invasive.pdf 22. https://www.vfw.or.at/wp-content/uploads/2018/06/Melzer_Alien_In_Us.pdf 23. https://bopco.myspecies.info/sites/bopco.myspecies.info/files/BopCo_DNA_Factsheet_Oxyura_jamaicensis_v4.pdf 24. https://cdn.1j1ju.com/medias/c2/71/39-alien-fate-of-the-nostromo-rulebook.pdf 25. https://www.liebertpub.com/doi/pdfplus/10.1089/ast.2016.1536 26. https://peerj.com/articles/7965.pdf 27. https://d-nb.info/1160387990/34 28. https://cdnsciencepub.com/doi/pdf/10.1139/f95-851 29. https://www.vai.org/wp-content/uploads/2023/03/HS-Alien-Invasion.pdf 30. https://portalgames.blob.core.windows.net/alien-artifacts/Alien-Artifacts-Rulebook.pdf 31. https://www.gf9games.com/aliens/wp-content/uploads/2020/09/Aliens-Rulebook.pdf 32. https://www.onslowcountync.gov/DocumentCenter/View/11842/Alien-Crafts_ALL-002 33. https://www.sciencedirect.com/science/article/pii/S2095311917618665/pdf?md5=11c62a06e2cf778b7eb90fb5e219d37a&pid=1-s2.0-S2095311917618665-main.pdf 34. https://www.jstage.jst.go.jp/article/jsbbs/55/3/55_3_335/_pdf 35. https://bopco.myspecies.info/sites/bopco.myspecies.info/files/BopCo_DNA_Factsheet_Asclepias_syriaca_v4.pdf 36. https://czechgames.com/files/rules/seti-rules-en.pdf 37. https://www.tandfonline.com/doi/pdf/10.1080/13102818.2004.10817081 38. https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1744-7348.1999.tb00889.x 39. https://gml.noaa.gov/outreach/info_activities/pdfs/Teacher_CTA_creature_features.pdf 40. https://www.preslia.cz/article/pdf?id=226 41. http://www.aquaticinvasions.net/2015/AI_2015_Chiesa_etal.pdf 42. https://www.clevelandmetroschools.org/cms/lib05/OH01915844/Centricity/Domain/195/AlienCSI%20Intro%20Package.pdf 43. http://download.ceris.purdue.edu/file/325 44. https://play.stmath.com/raft/resources/help/puzzle_talks/4_alien_bridge_V3.pdf 45. https://www.nature.com/articles/hdy198618.pdf 46. https://www.gf9games.com/aliens/wp-content/uploads/2021/01/Aliens-FAQ-v1.1.pdf 47. https://www.geneticsmr.org/articles/identification-of-introgressed-alien-chromosome-segments-associated-with-grain-quality-in-oryza-rufipogon-x-mr219-advanc.pdf 48. https://academic.oup.com/bioscience/article-pdf/68/7/496/25135896/biy057.pdf 49. https://cdnsciencepub.com/doi/pdf/10.1139/g90-057?download=true 50. https://bioone.org/journals/mammal-study/volume-46/issue-2/ms2020-0078/Genetic-Assessment-on-the-Origin-of-Alien-Macaques-in-the/10.3106/ms2020-0078.pdf