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, PPQ Permit Unit Referral Guide

USDA/APHIS/Biological and Scientific Services/Biotechnology Permits