With this activity book, you can relax and focus on one puzzle at a time.
High pressure boilers – 0826944043, Frederick M Frost Steingress Haro, paperback
A nice touch is the illustrated border on every single page.
Low Pressure Boilers – Hardcover By Steingress, Frederick M – ACCEPTABLE
This activity book includes spot-the-difference games that sharpen your focus.
Low Pressure Boilers – Hardcover By Steingress, Frederick M – GOOD
A nice touch in this activity book is the fun facts sprinkled between activities.
