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- Adam Matthew Digital (Firm), digitiser81
- Safari Books Online (Firm)78
- United States. Social Security Administration33
- Shakespeare, William, 1564-161626
- Poland24
- United States. Department of State24
- Kanopy (Firm)23
- Uniwersytet Łódzki20
- Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe19
- United States. Department of State, issuing body18
- Uniwersytet Śląski w Katowicach18
- Chopin, Frédéric, 1810-184916
- United States15
- Ulrich, Leon14
- Górczyński, Robert13
- Szymanowski, Karol, 1882-193713
- Uniwersytet Marii Curie-Skłodowskiej13
- Poland, participant in treaty12
- Słowacki, Juliusz12
- United States, participant in treaty12