Portland Public Library
Inventions
Type
http://bibfra.me/vocab/lite/Concept
Label
Inventions
Name
Inventions
Focus
Inventions
Actions
Share resources
Incoming Resources
Subject of
2
Omni
Cathedral, forge, and waterwheel, technology and invention in the Middle Ages, Frances & Joseph Gies
Outgoing Resources
Focus
1
Inventions
Link Analysis