Plans et dessins, tome III by Jannie Mayer is a detailed architectural and historical documentation focusing on the region of Picardie in France. Published by Patrimoine, this volume presents a curated collection of plans and drawings that illustrate the region’s built heritage, including churches, civic buildings, and residential structures. The work serves as both a scholarly resource and a visual archive, capturing the evolution of architectural styles and construction techniques specific to northern France. With meticulous attention to detail, Mayer provides valuable insights into regional design traditions and preservation efforts. This volume is part of a larger series dedicated to documenting France’s architectural patrimony, making it an essential reference for historians, architects, and conservationists interested in French cultural heritage.