Black and white negative print of drawing of Mac Dara Oratory, taken from a book.

Black and white negative print of drawing of a typical wooden farmhouse in medieval times in Germany.

Black and white negative print of drawing of a typical medieval German farmstead, showing plans of dwelling houses.

Black and white negative print of drawing of early medieval farmstead, possibly from Scotland or Shetlands, taken from a book.

Black and white negative print of plan of early medieval farmstead, possibly from Scotland or Shetlands, taken from a book.

Black and white negative print of plan of early medieval farmstead, possibly from Scotland or Shetlands, taken from a book.

Black and white negative print of plan of early medieval farmstead, possibly Celtic,drawing by [Dr. Becker].

Black and white negative print of plan of a turf hut, possibly Celtic, taken from a book.

Black and white negative print of plan of a turf hut, possibly Celtic, taken from a book.

Black and white negative print taken from book of group of Australian aborigines drawing concentric circles pattern on the rocks.