por Drysdale, Robert G [autor] | Hamid, Ahmad A [autor] | Baker, Lawrie R [autor].
por Ali, Barket [editor] | Hayat, S [editor] | Ahmad, A [editor].
por North American Masonry Conference (6: 1993 : Philadelphia, Pennsylvania) | Harris, Harry G [editor] | Hamid, Ahmad A [editor] | National Science Foundation (Estados Unidos) | Masonry Society.