Forms Drexel University 501(c) Letter [PDF] W-9 [PDF] REV-1832: 1099-Misc Withholding Exemption Certificate [PDF] Certification of Foreign Source Income [PDF] The Academy of Natural Sciences 501(c) Letter [PDF] W-9 [PDF] REV-1832: 1099-Misc Withholding Exemption Certificate [PDF] Certification of Foreign Source Income [PDF] Drexel University Online W-9 [PDF] REV-1832: 1099-Misc Withholding Exemption Certificate [PDF] Certification of Foreign Source Income [PDF]