Sentence:  I started going to the record exchange in Camden two or three times a week to look for the Rephlex <WSD>white labels</WSD> or test pressings that would end up there. I actually got one of the original Caustic Window vinyl LPs from there. 
Meaning of the word marked with <WSD> tags:  A vinyl record with a white label or white background (rather than artwork), typically used for test records or promotion.