CREATE TABLE table_50805 ("Year" TEXT, "Division" FLOAT, "League" TEXT, "Regular Season" TEXT, "Playoffs" TEXT, "Open Cup" TEXT)

Name the League which has a Regular Season of 3rd, atlantic?
SELECT "League" FROM table_50805 WHERE "Regular Season" = '3rd, atlantic'
SELECT "League" FROM "table_50805" WHERE "Regular Season" = '3rd, atlantic'