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A journey in 1860 to Rome, Milan, and Wolfenbüttel, financed by the sons of his childhood patron Petré, resulted in Fragmenta gothica selecta (1861) and another journey to the Ambrosian Library in Milan in 1863 to study the so-called Ambrosian Gothic manuscripts led to Codices gotici ambrosiani, which was published posthumously by his son Anders Erik Wilhelm Uppström in 1868.