Both consist of stamps and other philatelic material relating to subject
- Subject collection generally arranged chronologically by country
of issue
- Purpose-of-issue collection limited to stamps recognizing
organizations, such as EUROPA, International Red Cross, or Rotary International
- Thematic collection tells a story
- Develops a theme
- Some topics more than others lend themselves to this approach
- Aviation collection arranged by aircraft type
- Flowers arranged by genus, family, and species
- Art arranged by school or painting
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