PRIMARY SOURCES / FURTHER READING

Reference Library

Technical and historical resources for understanding measurements, reviewing recordings, and researching a site.

AUDIO / OFFICIAL DOCUMENTATION

Audacity: Spectrogram View

Technical guidance on viewing frequency content over time. A visual analysis tool, not proof of a sound’s origin.

MEASUREMENT / NIST

Understand traceability and why it alone does not guarantee fitness for a measurement purpose.

HISTORY / LIBRARY OF CONGRESS

Research strategies for documenting a building’s ownership, location, architecture, and historical context.

External references checked October 7, 2026. These sources support research methods; they do not endorse SRL or establish paranormal claims.

SRL-003

Separate documented history from stories and unverified claims.