This companion volume to Conservation of Brick provides a fundamental understanding of the processes of repair and reconstruction of earth structures. The technical aspects of the study are treated from the non-scientist point of view to develop a working understanding of this relatively new field. This important subject is rarely recognized, but many peoples worldwide have built, lived in and treasured earth structures. Their cultures have evolved with them and, therefore, earths and earth building have shaped a great part of the human environment. The conservation of earth structures is, therefore, not merely a neglected facet of the vernacular architecture; it is bound to the artistic core of living communities. Earth construction and its conservation, like other 'green' issues, draws a dedicated level of commitment from its aficionados. The problem of conservation, however, is far wider. Planning authorities, research organizations and owners are using broad-ranging, sometimes desperate, measures to retain a meaningful part of the huge heritage of earth structures worldwide.