Garg, K. L. Deterioration of stone and building materials by Algae and Lichens a review K.L. Garg, Shashi Dhawan and O.P. Agrawal - Lucknow National Research Laboratory for Conservation of Cultural Property 1988 - 43p. 24cm Subjects--Topical Terms: Building materials--Effects of temperature on Dewey Class. No.: 721.044 / GAR