Other permits and links that you may need to access are:
PPQ Form 526: Application and Permit to Move Live Plant Pests or Noxious Weeds
PPQ Form 525A: Application for Permit to Receive Soil
PPQ Form 546: Agreement for Postentry Quarantine - State Screening Notice
PPQ Form 621: Application for General Permits
PPQ Form 587: Application for Permit to Import Plants or Plant Products
PPQ Form 588: Application for Permit to Import Plants or Plant Products for Experimental Purposes
USDA/APHIS/Biological and Scientific Services/Biotechnology Permits