《元史·额外课志》载:“元有额外课。谓之额外者,岁课皆有额,而此课不在其额中也。然国之经用,亦有赖焉。谓之名凡三十有二,其一曰历日,二曰契本,三曰河泊,四曰山场,五曰窑冶,六曰房地租,七曰门摊,八曰池塘,九曰蒲苇,十曰食羊,十一曰荻苇,十二曰煤炭,十三曰撞岸,十四曰山查,十五曰曲,十六曰鱼,十七曰漆,十八曰酵,十九曰山泽,二十曰荡,二十一曰柳,二十二曰牙例,二十三曰乳牛,二十四曰抽分,二十五曰蒲,二十六曰鱼苗,二十七曰柴,二十八曰羊皮,二十九曰磁,三十曰竹苇,三十一曰姜,三十二曰白药。其岁入之数,唯天历元年可考云。” The extra history of Yuan Dynasty contains: "There are extra classes, which means extras and classes have their full amount, but this class is not in the middle of it. There are two, one of the calendar days, the second is the contract, the third is the river, four Yue mountain, Wuyue kiln, Liu said the rent, seven said stalls, eight said ponds, nine said Po Wei, ten Said edible sheep, eleven said Di Wei, twelve said coal, hit shore on the thirteen, fourteen said Shan check, fifteen said song, sixteen said fish, seventeen said paint, eighteen said yeast, nineteen said Yamazawa, on the 20th said swing, twenty-one said Liu, Twenty-two said dental cases, twenty-three said dairy, twenty-four said pumping, twenty-five Po, twenty-six said fry, twenty-seven said Chai, twenty-eight said sheepskin, twenty-nine said magnetism, 30 said bamboo reed, thirty-one said ginger, thirty-two said Baiyao its annual income of the number of the only calendar year can test cloud.