Introduction

The letters after each entry show the type of article, as follows:
[E] Editorial
[R] Review
[C] Correction/Addition
[N] Note
[S] Short article - up to 1 page
[M] Medium-length article - 1-3 pages
[L] Long article - over 3 pages
(SWL90) - in the index, an article in the Stamp World London 90 special issue (see Note 6 in the Pagination table)