50 CFR 13 outlines the general procedures and requirements for obtaining permits for various activities related to wildlife, such as feather import quotas and marine mammal permits. Applications must be properly addressed and include specific information, with permit fees required. The regulations provide uniform rules for application, issuance, renewal, and administration of permits. Permits are specific to the activity and not transferable, with penalties outlined for violations. Emergency variations from requirements may be approved by the Director. Applicants must submit applications to the appropriate Bureau official and certify their understanding of the regulations.