There are many great books on software solution architecture. Here are some of the best-known books in this area:

1. “Clean Architecture: A Craftsman’s Guide to Software Structure and Design” by Robert C. Martin – This book presents a comprehensive approach to software architecture, based on SOLID principles and domain-driven design.
2. “Software Architecture in Practice” by Len Bass, Paul Clements, and Rick Kazman – This book provides a practical guide to software architecture, with real-world examples and case studies.
3. “Patterns of Enterprise Application Architecture” by Martin Fowler – This book presents a collection of patterns and best practices for building enterprise-level applications, with a focus on architecture and design.
4. “Domain-Driven Design: Tackling Complexity in the Heart of Software” by Eric Evans – This book provides a comprehensive approach to software design, based on domain-driven design principles.
5. “Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions” by Gregor Hohpe and Bobby Woolf – This book presents a catalog of patterns for designing and implementing enterprise-level integration solutions, with a focus on messaging.
6. “Building Microservices: Designing Fine-Grained Systems” by Sam Newman – This book provides guidance on designing and building microservices architectures, with a focus on scalability, resilience, and deployment.
7. “The Architecture of Open Source Applications” edited by Amy Brown and Greg Wilson – This book provides case studies of the architecture of well-known open-source software projects, with insights into the design decisions and trade-offs.

These books are widely recognized as some of the best resources for learning about software solution architecture.