The Diagram Group

Collins card tricks

Year unknown Trevor Day and The Diagram Group

First aid

Year unknown R. M. Youngson and The Diagram Group

Giant book of pencil puzzles

Year unknown Peter Gordon, Mike Shenk, The Diagram Group, Mayme Allen, Janine Kelsch, Mark Danna, Jim Sukach, and Toni Lynn Cloutier

Giant Book of Pencil Puzzles

Year unknown Peter Gordon, Mike Shenk, The Diagram Group, Mayme Allen, Janine Kelsch, Mark Danna, and Jim Sukach

Science experiments on file

Year unknown Facts on File, Inc and The Diagram Group

Soccer skills

Year unknown Diagram Group. and The Diagram Group

The book of gambling games

Year unknown The Diagram Group and Diagram Group.

Weird and Wacky Facts

Year unknown K. R. Hobbie, Arkady Leokum, Sheryl Lindsell-Roberts, Robert Obojski, Michael J. Pellowski, Joseph Rosenbloom, Doug Storer, The Diagram Group, and William Tichy