Reddit reviews Cross-Time Engineer (Adventures of Conrad Stargard, Book 1)

This makes me think of Leo Frankowski's The Cross-Time Engineer. It's kind of a Connecticut Yankee in King Arthur's Court idea, where a modern-day Polish grad student gets whisked away to 13th century Poland, where one of the first things he realizes is that the Mongols are going to show up in 1240 AD and kill everybody.

Some of my favorite books that don't get mentioned much. I tried to tag the series if they were in it.

• Wildside by Steven Gould (Wildside))
  
• Conrad Stargard by Leo Frankowski ([Conrad's Time Machine](https://www.google.com/#q=Leo Frankowski AND Conrad's Time Machine), The Radiant Warrior, The Cross Time Engineer, The High-Tech Knight, The Flying Warlord, Lord Conrad's Lady, Conrad's Quest for Rubber, Lord Conrad's Crusade))
  
• New Kashubia by Leo Frankowski (A Boy and His Tank, Kren of the Mitchegai, The War With Earth))
  
• Copernick's Rebellion by Leo Frankowski (Copernick's Rebellion, The Fata Morgana, The Two-Space War))
  
• Solar Clipper Trader Tales by Nathan Lowell (Quarter Share, Half Share, Full Share, Double Share, A Light in the Dark, [Captain's Share](https://www.google.com/#q=Nathan Lowell AND Captain's Share), Owner's Share))
  
• The Getaway Special by Jerry Oltion (Anywhere but Here, The Getaway Special))
  
• Thunder and Lightning by John Varley ([Red Lightning](https://www.google.com/#q=John Varley AND Red Lightning), Red Thunder, Rolling Thunder, Dark Lightning))
  
• Tuf Voyaging by George R. R. Martin (Tuf Voyaging))
  

You should go read The Crosstime Engineer by Leo Frankowski. It's the 13th century, and Poland, but the guy does kickstart the industrial revolution just in time for the Mongol invasion, so there's that.

Oops, it's out of print. But somebody is selling a copy for $2,475, so it must be a even better than I remember.