The same situation applies to most foreign issues butuntil the advent of "The New World-Wide PostageStamp Catalog" few collectors in the United States wereaware of this fact. "The New World-Wide Postage StampCatalog" lists and gives values for practically all per-foration varieties of all stamps of the world. In this, aswell as in many other respects, "The New World-WidePostage Stamp Catalog" has greatly advanced our knowl-edge of foreign stamps.
Likewise the printed albums—those which providespaces in which to place each stamp—seldom bother withperforation varieties even for the stamps of the UnitedStates.