The practicalities of building-construction, timber buildings, and the physical effort of supporting military campaigning are not well covered in the literature. The majority of works on Roman buildings are concerned with stone and concrete structures, with an emphasis on public buildings, aqueducts, architectural appearance, dating, and historical associations. Recently there has been an interest in technical matters, and in reconstructions, but the emphasis is still on stonework and concrete and on appearance; discussion of the scale and method of supply of materials and labour is absent or very generalised. Work on constructional timbers (until recently somewhat lightly considered in excavations) tends to be confined to the largely descriptive.