Leases and the SFAS's that cover it

Just for reference here are the key SFAS's that cover leases:
SFAS 13 - Accounting for Leases (Nov 1976)
SFAS 23 - Inception of the Lease
SFAS 27 - Classification of Renewals or Extensions of Existing Sales-Type or Direct Financing Leases
SFAS 28 - Accounting for Sales with Leasebacks
SFAS 29 - Determining Contingent Rentals
SFAS 91 - Nonrefundable Fees & Costs Associated with Originating or Acquiring Loans and Initial Direct Costs of Leases
SFAS 98 - Accounting for Leases
SFAS 145 - Rescission of FASB Statements 4, 44, and 64 Ammendment of FASB No. 13, and Technical Corrections (Apr 2002)
SFAS 146 - Accounting for Costs Associated with Exit or Disposal Activities

I included the issue dates for SFAS 13 and SFAS 145 above because they were the only ones Wiley did that for. I'm about to start the module, and I guess I'll find out soon why, or if, that's important.