pubs.usgs.gov · Manuscnpt approved for publication, November 3, 1989 are 1 800 2000 2000 1 900 1...

Post on 12-Sep-2018

213 views 0 download

Transcript of pubs.usgs.gov · Manuscnpt approved for publication, November 3, 1989 are 1 800 2000 2000 1 900 1...