The official repository for EIA-649C is the SAE International website. It can be purchased as a standalone digital PDF, a printed document, or through a subscription model.
EIA-649C is the National Consensus Standard for Configuration Management. Developed by the TechAmerica G-33 Configuration Management Committee and currently published by SAE International, it outlines the core principles and best practices for managing complex systems and products. eia-649c free download
For students, hobbyists, or independent researchers: use the ANSI read-only portal or the free MIL-HDBK-61B. You will get 95% of the value without spending a dime. The official repository for EIA-649C is the SAE