Evidences in History (Nouns)

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Across
  1. 2. The famous coin collection in India is found in Reserve Bank Museum here.(Proper Noun)
  2. 4. Dates on the coins tell us about the eras of different ________.(common noun)
Down
  1. 1. Collection and study of coins.(common noun)
  2. 3. Designs of the rulers' portraits on the coins highlight the ______ of that period.(Abstract Noun)