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U.S. Bureau of Internal Revenue (1)
- Letter from Russel, Haide (German Consulate) to U.S. Bureau of Internal Revenue
U.S. Immigration and Naturalization (1)
- Letter from Russel, Haide (German Consulate) to U.S. Immigration and Naturalization
Uebersee-Verlag (1)
- Letter from Plessner, Helmuth to Hoffmann (Uebersee-Verlag)
Uexkuell, Thure von (129)
- Letter from Uexkuell, Thure von to Plessner, Helmuth
- Letter from Plessner, Helmuth to Uexkuell, Thure von
- Letter from Uexkuell, Thure von to Plessner, Helmuth
- Letter from Plessner, Helmuth to Uexkuell, Thure von
- Letter from Uexkuell, Thure von to Müller, Konrad
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Uexkuell, von (1)
- Letter from Müller-Suur, H. to Uexkuell, von
Uitgeverij het Spectrum N.V. (1)
- Letter from Plessner, Helmuth to Uitgeverij het Spectrum N.V.
Uitgeverij Pantheon (1)
- Letter from Brongersma, E. to Kollar, K.G. (Uitgeverij Pantheon)
Ulrich, Ferdinand (2)
- Letter from Hess, Gerhard (Deutsche Forschungsgemeinschaft) to Ulrich, Ferdinand
Umrath, H. (2)
- Letter from Umrath, H. to Plessner. H.
UNESCO (1)
- Letter from Plessner, Helmuth to n.d. (UNESCO)
Ungerer, E. (2)
- Letter from Plessner, Helmuth to Ungerer, E. (Wissen und Wirken)
- Letter from Ungerer, E. (Wissen und Wirken) to Plessner, Helmuth
Union Deutsche Verlagsges. (1)
- Letter from Plessner, Helmuth to n.d. (Union Deutsche Verlagsges.)
Universitas (3)
- Letter from Plessner, Helmuth to Baehr, H.W. (Universitas)
- Letter from Plessner, Monika to Baehr, H.W. (Universitas)
- Letter from Plessner, Helmuth to Baehr, H.W. (Universitas)
Universität des Saarlandes (12)
- Letter from Plessner, Helmuth to Scheel, H.L. (Universität Saarland)
- Letter from Plessner, Helmuth to Krings, H. (Universität des Saarlandes)
- Letter from Plessner, Helmuth to Eggers, Hans (Universität des Saarlandes)
- Letter from Plessner, Helmuth to Rathjens, C. (Universität des Saarlandes)
- Letter from Plessner, Helmuth to Schmoll gen. Eisenwerth, J.A. (Universität des Saarlandes)
- Letter from Plessner, Helmuth to Funke, Gerhard (Universität des Saarlandes)
- Letter from Plessner, Helmuth to Funke, Gerhard (Universität des Saarlandes)
- Letter from Plessner, Helmuth to Liefmann-Kiel (Universität des Saarlandes)
- Letter from Plessner, Helmuth to Krings, Hermann (Universität des Saarlandes)
- Letter from Plessner, Helmuth to Krings, J. (Universität des Saarlandes)
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Universität Erlangen (6)
- Letter from Plessner, Helmuth to Beyschlag, Siegfried (Universität Erlangen)
- Letter from Plessner, Helmuth to Loewe (Universität Erlangen)
- Letter from Plessner, Helmuth to Weippert, Georg (Universität Erlangen)
- Letter from Plessner, Helmuth to Lichtenstein, E. (Universität Erlangen)
- Letter from Plessner, Helmuth to Lichtenstein, E. (Universität Erlangen)
- Letter from Plessner, Helmuth to Zeltner, H. (Universität Erlangen)
Universität Erlangen-Nuernberg (2)
- Letter from Plessner, Helmuth to Pfeiffer (Universität Erlangen-Nuernberg)
- Letter from Plessner, Helmuth to Heubeck (Universität Erlangen-Nuernberg)
Universität Göttingen (2)
- Letter from Plessner, Helmuth to Egner, E. (Universität Goettingen)
- Letter from Plessner, Helmuth to Kromphardt (Universität Goettingen)
Universität Hamburg (6)
- Letter from Plessner, Helmuth to Merck, W. (Universität Hamburg)
- Letter from Plessner, Helmuth to Merck, W. (Universität Hamburg)
- Letter from Plessner, Helmuth to Spuler, B. (Universität Hamburg)
- Letter from Plessner, Helmuth to Voigt, Fritz (Universität Hamburg)
- Letter from Plessner, Helmuth to Ralfs, Guenter (Universität Hamburg)
- Letter from Plessner, Helmuth to Ralfs, Guenter (Universität Hamburg)
Universität Heidelberg (4)
- Letter from Plessner, Helmuth to Muehlmann, W.E. (Universität Heidelberg)
- Letter from Plessner, Helmuth to Ruestow, Alexander (Universität Heidelberg)
- Letter from Plessner, Helmuth to Ruestow, Alexander (Universität Heidelberg)
- Letter from Plessner, Helmuth to Ruestow, Alexander (Universität Heidelberg)
Universität in Mainz (1)
- Letter from Plessner, Helmuth to Rintelen, von (Universität in Mainz)
Universität Kiel (1)
- Letter from Plessner, Helmuth to Brockhoff, K. (Universität Kiel)
Universität Köln (3)
- Letter from Plessner, Helmuth to Rassow, Peter (Universität Köln)
- Letter from Plessner, Helmuth to Stier-Somlo (Universität Köln)
- Letter from Plessner, Helmuth to Schieder, Th. (Universität Köln)
Universität Muenchen (4)
- Letter from Plessner, Helmuth to Wenzl, A. (Universität Muenchen)
- Letter from Plessner, Helmuth to Wenzl, A. (Universität Muenchen)
- Letter from Plessner, Helmuth to Werner, J. (Universität Muenchen)
- Letter from Plessner, Helmuth to Müller, Max (Universität Muenchen)
Universität Tübingen (5)
- Letter from Plessner, Helmuth to Flitner, A. (Universität Tübingen)
- Letter from Plessner, Helmuth to Dahrendorf, Ralf (Universität Tübingen)
- Letter from Plessner, Helmuth to Rothfels, Hans (Universität Tübingen)
- Letter from Plessner, Helmuth to Rothfels, Hans (Universität Tübingen)
- Letter from Plessner, Helmuth to Kneser, Hellmuth (Universität Tübingen)
Universität Wuerzburg (1)
- Letter from Plessner, Helmuth to Arnold, Wilhelm (Universität Wuerzburg)
University of Wisconsin (1)
- Letter from Plessner, Helmuth to Becker, Howard (University of Wisconsin)
Unseld (1)
- Letter from Plessner, Monika to Unseld (Suhrkamp Verlag)
Unseld, Siegfried (73)
- Letter from Unseld, Siegfried to Plessner, Helmuth
- Letter from Unseld, Siegfried to Plessner, Helmuth
- Letter from Unseld, Siegfried to Plessner, Helmuth
- Letter from Plessner, Helmuth to Unseld, Siegfried
- Letter from Unseld, Siegfried to Plessner, Helmuth
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Ursell, Ilse J. (2)
- Letter from Ursell, Ilse J. (Society for the Protection of Science and Learning) to Plessner, Helmuth
- Letter from Ursell, Ilse J. (Society for the Protection of Science and Learning) to Plessner, Helmuth
Ursula (1)
- Letter from Ursula to Plessner, Helmuth
Uslar, Detlav von (12)
- Letter from Zierold, Kurt (Deutsche Forschungsgemeinschaft) to Uslar, Detlev von
- Letter from Hess, Gerhard (Deutsche Forschungsgemeinschaft) to Uslar, Detlev von
- Letter from Uslar, Detlev von to Plessner, Helmuth
- Letter from Uslar, Detlev von to Plessner, Helmuth
- Letter from Uslar, Detlev von to Plessner, Helmuth
- Letter from Plessner, Helmuth to Uslar, Detlev von
- Letter from Uslar, Detlev von to Plessner, Helmuth
- Letter from Uslau, Detlav to Plessner, Helmuth
- Letter from Uslau, Detlav to Plessner, Helmuth
- Letter from Uslar, Detlev von to Plessner, Helmuth
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Uslar, Detlev von (10)
- Letter from Zierold, Kurt (Deutsche Forschungsgemeinschaft) to Uslar, Detlev von
- Letter from Hess, Gerhard (Deutsche Forschungsgemeinschaft) to Uslar, Detlev von
- Letter from Uslar, Detlev von to Plessner, Helmuth
- Letter from Uslar, Detlev von to Plessner, Helmuth
- Letter from Uslar, Detlev von to Plessner, Helmuth
- Letter from Plessner, Helmuth to Uslar, Detlev von
- Letter from Uslar, Detlev von to Plessner, Helmuth
- Letter from Uslau, Detlav to Plessner, Helmuth
- Letter from Uslau, Detlav to Plessner, Helmuth
- Letter from Uslar, Detlev von to Plessner, Helmuth
Utitz, Emil (6)
- Letter from Utitz, Emil to Plessner, Helmuth
- Letter from Utitz, Emil to Plessner, Helmuth
- Letter from Plessner, Helmuth to Utitz, Emil
Utten, H. (1)
- Letter from Utten, H. to Plessner, Helmuth