• more than 4300 entries written by specialsts
• a great number of external links to documents with statistical data, diagrams, and charts
• a circuit of 4400 crossreferences between entries

Search software:
[version: 18.1.gzeco]
• Direct search of the headword index
• Approximate search of headwords activated when no exact match is found
• Advanced search by field:
  - Headwords
  - Entire text
• Use of wild-card characters and logical operators
• Instant search of every word within an entry
• An Internet connection is needed to access the external documents

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