Dave Diehl
Moderator
Member # 8

Tube Turns - Markl's employer still offers the set of these papers in their Piping Engineering book.

I called them to order mine at (502)774-6011.

Their mailing address is:
Tube Turns Technologies, Inc.
2900 W. Broadway
P.O.Box 32160
Louisville, KY 40232

$35


Again, thanks to Dave for answering this frequently asked question.