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The most useful first question when interpreting an unfamiliar sheet is

  • A.which publisher happened to produce the sheet
  • B.how many separate colours were used to print it
  • C.what projection the sheet was originally drawn on
  • D.what is the scale and when was it surveyed

Answer: D

Scale settles what could possibly be shown, and the date settles how far the content can be trusted today. Both of those bear on every later reading, whereas the publisher and the printing are usually incidental to what can be concluded.

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