used 13-131, the extensive study of many thousands of examples arranged by plate, contained in seven albums, a few re-entries or varieties noted and including a few plates being almost complete reconstructions and many others being half complete or more, many multiples with pairs, strips and blocks, some used on entire, some better cancellations, also a range of black plates and some later Line-Engraved with corner letters BA or BG, etc.; mostly with three or four margins, condition a little mixed but many neatly cancelled and attractive included. An extremely useful reference in itself and an excellent basis for continuation