I mentioned the Brown(e) Issue system below, and noted that there was not a wikipedia entry for it. A couple of interesting things.
Tom Roper pointed out that it is indeed Browne and not Brown as I typed, and points to Harrod's glossary to provide some description. Interestingly, a search on the Browne Issue System on Google brings back only twenty six results which still means that there is not much available about it, although more than there is for the Brown Issue System ;-)
Second, I was very interested to see the response which suggested that I create a Wikipedia entry myself. And indeed some folks went ahead and created a stub. And the stub is now under the right spelling, with a redirect from the first entered 'Brown Issue System'.
Now, I was going to look into this myself, except that I am in Ohio State University this week on an OCLC professional development course. I am away from the library and have not got around to requesting stuff. I will look at it next week - but maybe by then it will be a long and extensive entry!
Incidentally, I have been traveling by bus to Ohio State. We live a ten minute bus ride north of OSU. It made me realize how much I miss public transport: I am used to a bus or train ride to and from work - where you can read or just sit and watch the world go by.