publisher: Worldwatch Inst
publish date: January 1st 1989
format: paperback pages: 70
ISBN:
0916468895 (9780916468897)
ISBN:
0916468836 (9780916468835)
publisher: Worldwatch Institute
publish date: 1991
format: paperback pages: 62
language: English
ISBN:
1878071041 (9781878071040)