Here are some links we hope you'll enjoy and which should provide additional information relevant to Porsche-Diesel owners:

• www.porsche-diesel-club.de - Google English Translation
  Please visit our friends at PORSCHE-DIESEL-Club Europa e.V.
• www.stasher.us
  Philip Carney's web site with an excellent written history of Porsche-Diesel.
• online.wsj.com/article/SB120769876086199765.html
  A Wall Street Journal article on the increasing popularity of old tractor restoration and on the increasing value of older rarer models.  Non-technical but a quick and enjoyable read.
• A nice article by Thomas Shulz appears in Christophorus 335, page 70 and features the Porsche-Diesel Club of Europe with a gathering of 76 restored tractors.
• Another 1-pager by Thomas Shulz appears in Christophorus 314 (June-July 2005), page 11 and features the beautifully restored Junior of Harald Stegen.
• Here is a photo gallery from what looks to have been a wonderfult Porsche-Diesel gathering in the Netherlands in 2013.