Minimum quantity for "FEMA P-58-6, Guidelines for Performance-Based Seismic Design of Buildings" is 1.
Minimum quantity for "FEMA P-58-2, Seismic Performance Assessment of Buildings, Volume 2 - Implementation Guide" is 1.
Minimum quantity for "FEMA P-58-1, Seismic Performance Assessment of Buildings, Volume 1 - Methodology" is 1.