Carson had made a radical proposal: that, at times, technological progress is so fundamentally at odds with natural processes that it must be curtailed. The most important legacy of Silent Spring, though, was a new public awareness that nature was vulnerable to human intervention.

• Troy Bilt Gtx 16 Lawn Tractor
• Troy Bilt Gtx 20 Attachments

Troy Bilt Gtx 16 Lawn Tractor

You should find it here. There are 3 pages of Bolens manuals. Otherwise sign up to My Tractor Forum and do a search there. The Durotrac was really a sub-compact tractor rather than a lawn mower.

Troy Bilt Gtx 20 Attachments

I service one and was sold on it the very first time I touched it. Down side is they run real transmissions and Eatons stopped servicing them decades ago so parts can be a problem. If that does not do it for you try searching with this '78590-Bolens5100SeriesDuratracTractorsServiceRepai rWorkshopManualModel5117hDgt17005118hGt1800 5120hGt2000.pdf' That brought up a dozen or so likley prospects. Also GT Forum has a large Bolens manuals section.