By Dominic Tombs
By Pacione, Michael
By Thordarson, Thor, Hoskuldsson, Armann
By Mike Mayes
By Thom, Martin, Armstrong, Eileen
By Carolyn Franklin
By Valerie Nicol, Lynn Cockburn
By Tilley, Roger
By Douglas Rogers, Rogers, Douglas
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By Julian Sayarer
By Doe, Paul
By Delia Famconer
By Various
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By White Kenneth
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By Martinez Diaz, Nelson, Vàzquez, German
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By Zambrano, Maria
By World Overview of Conservation Approaches and Technologies (WOCAT), Liniger, Hanspeter, Critchley, WILLIAM, Critchley, WILLIAM