I thought we'd kick the series off with an incredibly useful tool for historical research.
The Hall-Carpenter Archives, named after Marguerite Radclyffe Hall and Edward Carpenter, are based in the London School of Economics, and make up a collaboration of collections, the biggest three being 'The Hall-Carpenter Main Collection' in the LSE Library, 'The Lesbian and Gay News and Media Archive' at Middlesex University, and 'The HCA Oral History Collection' which is part of the British Library.
Also of note is the Press Cuttings Collection, which moved in 1990 to the Greenwich Lesbian and Gay Centre.
I'd urge you to take a look at the website and any other material you can find because this archive is a valuable resource that not nearly enough people have heard of!
Watch this space for the rest of the series of interesting, inciteful, entertaining and thought-provoking blogs on LGBT History.