The text field above accepts catalog numbers or number ranges separated by commas or white space. To get all regular WWI provisionals as listed in the Scott Catalogue type “136-162” (no white space between hyphen and numbers!), or “B1-34, CB1-6” for all semi-postal stamps. Note that this range notation doesn’t include subnumbers like “a”, “b”, “c” varieties. Catalog numbers are case-sensitive.