1
by Cline, William R.
Published 1992
Book
2
by Setterberg, Fred
Published 1993
Book
3
Published 1994
Book
4
by Nemerow, Nelson Leonard.
Published 1978
Book
5
by Scorer, R. S. 1919-
Published 1973
Book
6
by Brodine, Virginia
Published 1973
Book
7
Published 1971
Book
8
by Rich, Gerald A.
Published 1990
Book
9
Journal / Magazine
10
by Baxter, William F., 1929-
Published 1974
Book
12
by Mellanby, Kenneth
Published 1972
Book
13
by Meadows, Donella H.
Published 1992
Book
14
by Lomborg, Bjørn, 1965-
Published 2001
Book
15
Published 2000
Book
16
Published 1970
Book
17
by Base, Graeme.
Published 1992
Book
18
19
Published 2004
Book
20
Published 1970
Book