The “05” designation indicates that the standard was approved in 2005. It was adopted by reference into the International Building Code (IBC) 2006 and IBC 2009 . Therefore, any building permit issued under those IBC editions legally required compliance with ASCE 7-05, particularly Chapter 11 (Seismic Design Criteria) through Chapter 23 (Seismic Reference Information).
Some state or municipal building departments have scanned public reference copies. For example, the sometimes provides historical codes for reference but not for redistribution. You may view but not download these. asce 7-05 seismic pdf
Be careful with low-quality scans. Seismic design relies on . If you download a grayscale, distorted PDF, the contours on the spectral acceleration maps will be illegible. You cannot properly determine $S_s$ and $S_1$ from a bad scan. If you cannot afford the legal PDF, use the current ASCE 7-22 maps to understand the geology, but refer to the 7-05 formulas for the math. The “05” designation indicates that the standard was