Assertion: booklet | /r/HasProperty | introduced containing 1¢ stamps
Facets:
value: in 1907
type: TEMPORAL
Source sentences:
text: The first two U. S. booklet issues (1900 and 1903) offered only stamps denominated at the normal letter rate (2¢), but in 1907 booklets were introduced containing 1¢ stamps suitable for post cards.