Editorial responsibility
The catalog is written and maintained by the WebTumble editorial desk, which is responsible for what stands on each of these pages. Where one of them describes a source published by somebody else, that description is ours and the source is theirs, and the host is named on every line so the distinction is visible without following a link.
Enquiries, including corrections and notices about a source that has closed, go to the address in the publication details above. Corrections go to the editorial address on the contact page, which sets out what is useful to include, and the short answer is the page address and the sentence, quoted.
Corrections policy
A confirmed factual error is corrected and the review date on the page moves with it. Where a source has changed, its annotation is rewritten to describe what is actually there now. Where a source has closed, the entry says so and keeps the line rather than deleting it, because the closure is usually the more useful fact for a reader arriving from an old citation.
Dates are not decorative. Every source carries the date it was last reached and every reference page carries a review date, and both are claims that can be wrong. They are the part of the site most worth reporting when they have fallen behind.
Copyright and attribution
The text of the pages, the annotations, the illustrations and the timeline are the publication's own work. Quoting a sentence or two with a link is welcome and needs no permission. Reproducing an entry wholesale is not, because an annotated source list is the work rather than a list of facts about the world.
The material the catalog points at belongs to whoever published it. Titles of sources are used to identify them, which is what a catalog does, and no claim is made over any of them. Product names, service names and organisation names appear on these pages for identification only and remain the property of their respective owners.
Sources and third parties
The site is deliberately built without third-party components. Fonts are served from this domain, there is no analytics, no advertising and no embedded widget, and the three decoders run entirely in the browser. The privacy page sets that out in detail, and the reason it is short is that there is very little happening.
Outbound links go to sources named with their host. Following one puts a reader on somebody else's site under their terms, which this publication cannot speak for and does not attempt to.
Accuracy and limits
Pages are written by reading the sources and are accurate as far as the review date shown on them. They describe what other parties publish, and where those parties have shut down the pages say so with a year. Nothing here is professional advice in any regulated field: the entry on 3D ultrasounds collects clinical and regulatory sources rather than substituting for either, and the same applies wherever a subject has professional bodies of its own.