A Glut of British Overseas Postage Rate Data

What is happening in the United States on the subject of pre-UPU trans-Atlantic mail to and from this country and Europe and in transit to farther destinations? This will be the subject of this quarterly column in English for Postgeschichte.
A seventh book on British postage rates abroad published since 1989 has prompted Richard F. Winter, president of the U.S. Philatelie Classics Society, to assess this «proliferation of British rate bo