Delholm Educational

year of pub­li­ca­ti­onISBNauthor(s)title
1984978-1-870005-00-5Janet RedpathDelholm Fun Book of Mathematical Puzzles
  ''978-1-870005-01-2   ''One Hundred and Eighty
2000978-1-870005-44-9P. BaconFun with Physics (Delholm Fun Books S.)