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Because we may not know about the item. Send the maintainer the details and a scan/photo.
Because that would be a lot of compilations. The policy is to only list compilations that have tracks that haven't been released as a single, only released on vinyl, rare versions and remixes; or compilations that are intended for radio stations and music industry, compilations released with a magazine, or orignal Factory and related compilations. We are even more restrictive when the track is in a DJ mix (sequenced together with other tracks.)
Because that would be a lot of downloads. The policy is to only list downloads that consists of rare or unusual tracks, remixes, and recordings, or downloads uniquely packaged together. Nor do we specify the regions a download is available in.
The European Union is more like one big market. Media may be pressed in one country and sold in another. Releases that are manufactured in Europe is often listed as EU or UK in the discography.
Based upon information from "steinomite" and "joe davola", these are the pressing plants used:
MPO France (FR)
An acetate is used as the cut prior to the cutting of the master disc. It is often used by the label, engineer, producer, or other party to get an idea of the recording once mass-produced.
Acetates (contains no acetate...) are heavier than vinyl and may smell strange. Acetates also degrade quickly when played.
WLTP stands for White Label Test Press and is a test pressing of a vinyl record, often given a white label (plain white label or a label from the pressing plant). The WLTP is used to check the quality of the pressing. Sometimes the WLTP is used as a promo. WLTPs with blank or handwritten labels are normally not added to the Discography.
A flexi disc is a thin vinyl sheet designed to be played on a turntable, but so thin it could easily be distributed with a magazine or such.
An obi strip is a strip of paper wrapped around the CD case or LP sleeve (or some other media), most often a release from Japan. The obi strip provides information about the product.
Well, one might suspect that some/many of them are unofficial... If you have further information regarding this matter, please contact the discography maintainer.
These cassettes are unofficial (pirate) cassettes, mainly from Indonesia, and therefore not listed. Some of the known releases are:
Audio Mast Records
BMG Direct Marketing and Columbia House are examples of mail-order music clubs. The club manufactures and distributes the records themself to the club members.