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This library is built in the open.
If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

Figure A
An illustration depicts a heavy timber framework, possibly part of a mining structure or a building's interior. A massive vertical wooden post on the left supports horizontal and diagonal beams. In the center, a low wooden fence or retaining wall made of planks is visible against a rocky, uneven ground. The top left corner suggests a thatched or straw-covered roof.