Protecting and preserving South African aeolianite surfaces from graffiti

by Helm,Charles W., Cawthra,Hayley C., Cowling,Richard M., Vynck,Jan C. De, Lockley,Martin G., Marean,Curtis W., Dixon,Mark G., Helm,Carina J.Z., Stear,Willo, Thesen,Guy H.H., Venter,Jan A.
Published 2021