州学院（State College）是美国宾夕法尼亚州的一个城市，行政级别为自治镇，隶属于中央县，整个城市实际都是宾夕法尼亚州立大学的主校园区，绰号为“幸福谷”。
A bill; a commercial document issued by a seller to a buyer indicating the products, quantities and agreed prices for products or services that the seller has already provided the buyer with. An invoice indicates that, unless paid in advance, payment is due by the buyer to the seller, according to the agreed terms.