CREATE TABLE table_204_843 (id DECIMAL, "volume" DECIMAL, "year" TEXT, "names" TEXT, "articles" DECIMAL, "pages" DECIMAL, "images" DECIMAL, "maps" DECIMAL, "number of copies" DECIMAL)

what is the difference in years between the first volume published and the 13th volume published ?
SELECT ABS((SELECT "year" FROM table_204_843 WHERE "volume" = 1) - (SELECT "year" FROM table_204_843 WHERE "volume" = 13))
SELECT ABS((SELECT "year" FROM "table_204_843" WHERE "volume" = 1) - (SELECT "year" FROM "table_204_843" WHERE "volume" = 13))