RT Journal Article
SR Electronic
T1 How Much Are Nature's Services Worth?
JF Science
JO Science
FD American Association for the Advancement of Science
SP 960
OP 964
DO 10.1126/science.197.4307.960
VO 197
IS 4307
A1 Westman, Walter E.
YR 1977
UL http://science.sciencemag.org/content/197/4307/960.abstract
AB