This listing includes three consecutive annual volumes from the How It Works: Science Supplement series — the 1986, 1987, and 1988 editions.

Produced by H.S. Stuttman Co. as companion volumes to the How It Works encyclopedia, these books offered updated science and technology articles, detailed diagrams, and full-color photographs. Each hardcover volume continues the tradition of accessible scientific education that made How It Works a staple in home libraries throughout the 1970s and 1980s.

Contents include:
• Yearly advancements in science, medicine, and engineering
• Articles on innovations in space exploration, computing, and environmental science
• Clear diagrams and photos explaining modern concepts in everyday language
• Indexed and cross-referenced for easy reference

These volumes display attractively together, with matching tan and red cloth bindings and gold foil titles. They stand alone as an independent mini-set or serve as supplements to a complete How It Works encyclopedia collection.

Condition Overview:
• Covers: Light wear, mild shelf rubs, no major staining
• Gilt lettering: Bright and unfaded
• Pages: Clean, tight, unmarked, no foxing or highlighting
• Spines: Square and intact