1 Although any individual may develop a case of pinworms, the infection occurs most frequently in school children between 5 to 10 years of age.  Pinworm infections occur in all socioeconomic groups; however, human-to-human spread is favored by close, crowded living conditions. Spread among family members is common.
Before they start collecting, stamp collectors try to identify the types of stamps. These will help them segregate and sort stamps according to their classification. On its basic concept, there are three main classifications of stamps â special, commemorative, and definitive.
Stamp Values for a Stamp Collection, Old Stamps and Current Rate Stamps. Custom Postage Stamps-Design your own Stamp and Personalize your Mail. Custom Postage Stamps-Design your own Stamp and Personalize your Mail.Postage Stamp Picture Gallery-Photos of Early US and Worldwide Stamps. Postage Stamp Picture Gallery.tamp Values for a Stamp Collection, Old Stamps and Current Rate Stamps. Custom Postage Stamps-Design your own Stamp and Personalize your Mail. Custom Postage Stamps-Design your own Stamp and Personalize your Mail.