For detailed NASA documents on Nimbus...
Go here:
http://www.geocities.com/bobandrepont/unmannedpdf.htm
and scroll down to the Nimbus section.
Space/Science » in reply to Nimbus' 40th Anniversary
Go here:
http://www.geocities.com/bobandrepont/unmannedpdf.htm
and scroll down to the Nimbus section.