National Trust of Australia (New South Wales) & Gibbons, G. S. (1978). Maintaining and restoring masonry walls: Current understanding and maintenance methods on brick and stone walls: papers and discussion at a symposium held at the New South Wales Institute of Technology, 2-3 February, 1978. National Trust of Australia (New South Wales).

National Trust of Australia (New South Wales) и G. S. Gibbons. Maintaining and Restoring Masonry Walls: Current Understanding and Maintenance Methods on Brick and Stone Walls: Papers and Discussion at a Symposium Held at the New South Wales Institute of Technology, 2-3 February, 1978. Sydney: National Trust of Australia (New South Wales), 1978.

National Trust of Australia (New South Wales) и G. S. Gibbons. Maintaining and Restoring Masonry Walls: Current Understanding and Maintenance Methods on Brick and Stone Walls: Papers and Discussion at a Symposium Held at the New South Wales Institute of Technology, 2-3 February, 1978. National Trust of Australia (New South Wales), 1978.