CREATE TABLE "commemorative_silver_dollar_series" (
  "year" real,
  "artist" text,
  "mintage_proof" text,
  "issue_price_proof" text,
  "mintage_bu_clarification_needed" text,
  "issue_price_bu_clarification_needed" text
);

Question: What's listed as the Issue Price (BU) [Clarification Needed] with a Mintage (Proof) of 29,586?
SQL: SELECT "issue_price_bu_clarification_needed" FROM "commemorative_silver_dollar_series" WHERE "mintage_proof"='29,586';

Question: Who is the Artist with an Issue Price (BU) [Clarification Needed] of n/a along with  a Year larger than 2004, and Mintage (Proof) of 25,000?
SQL: SELECT "artist" FROM "commemorative_silver_dollar_series" WHERE "issue_price_bu_clarification_needed"='n/a' AND "year">2004 AND "mintage_proof"='25,000';

Question: What's the average Year with an Issue Price (Proof) of $49.95, and Artist of W.H.J. Blakemore?
SQL: SELECT AVG("year") FROM "commemorative_silver_dollar_series" WHERE "issue_price_proof"='$49.95' AND "artist"='w.h.j. blakemore';

Question: What's the Issue Price (BU) [Clarification Needed] with a Year larger than 2002 and Mintage (Proof) of 50,000?
SQL: SELECT "issue_price_bu_clarification_needed" FROM "commemorative_silver_dollar_series" WHERE "year">2002 AND "mintage_proof"='50,000';