000 00326nam a22000857a 4500
008 170218b xxu||||| |||| 00| 0 eng d
100 _aFelix, Ervin J
_c Worldwide watermarks and perforations from 1840 to date
245 _aThe stamp collector's guidebook of worldwide watermarks and perforations
650 _aWatermarks | Perforations
999 _c2273
_d2273