%0 Book Section %D 1994 %T Acid Rain and its Impact: The Critical Loads Debate %A Caporn, S.J.M %A Carroll, J. %A Lei, Y. %A Song, W. %A Read, D.J. %A Lee, J.A. %A Battarbee, R.W. (Eds) %I Environmental Change Research Centre/ENSIS %C London %P 146-150 %& Critical loads of nitrogen for upland heather (Calluna vulgaris).