CREATE TABLE "the_sheets" (
  "ecosystem" text,
  "date_of_issue" text,
  "place_of_issue" text,
  "no_stamps_in_sheet" real,
  "face_value" text,
  "printer" text
);

Question: When the face value is 42¢, what was the issue's date?
SQL: SELECT "date_of_issue" FROM "the_sheets" WHERE "face_value"='42¢';

Question: Which location has the ecosystem of kelp forest?
SQL: SELECT "place_of_issue" FROM "the_sheets" WHERE "ecosystem"='Kelp Forest';

Question: How many stamps have a face value of 37¢ and were printed in the banknote corporation of america?
SQL: SELECT COUNT("no_stamps_in_sheet") FROM "the_sheets" WHERE "face_value"='37¢' AND "printer"='Banknote Corporation of America';

Question: Who was the printer of Estes Park, Colorado?
SQL: SELECT "printer" FROM "the_sheets" WHERE "place_of_issue"='Estes Park, Colorado';

Question: The stamp was 39¢, who was the printer?
SQL: SELECT "printer" FROM "the_sheets" WHERE "face_value"='39¢';