CREATE TABLE table_38310 ("Start month" CLOB, "End month" CLOB, "Cover" CLOB, "Spine" CLOB, "Indicia" CLOB, "Masthead" CLOB, "Number of issues" FLOAT)

Which spine has 12 issues?
SELECT "Spine" FROM table_38310 WHERE "Number of issues" = '12'
SELECT "Spine" FROM "table_38310" WHERE "Number of issues" = '12'