Editorial policy
Original evidence, clear dates and visible assumptions.
Sources
Prefer original reports, institutional repositories, official policy documents and recognised specialist resources. Each substantive guide links to its sources. Archive captures are identified as historical evidence.
Originals and new writing
Original PDFs are preserved as files. New guides explain the subjects in fresh text; they do not silently replace original conclusions or suggest new field measurements. Recovered historical pages are labelled and credited.
Currency
A page update date records editorial work, not a new survey of every facility mentioned. Historical contacts and operations are kept separate from current claims. If a current fact cannot be established, omit it or state the limit.
Calculations
Tools show their formulas, units and assumptions. Inputs remain in the browser. Results are illustrative and do not replace site-specific assessment.
Corrections
Send the page URL and supporting evidence to [email protected]. Corrections should improve the evidence and keep the publication context visible.