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                <text>Martin H. Prior's personal archive&#13;
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              <text>b/w photograph on a memorial plaque, http://archiwum.wfis.uw.edu.pl/bibfis/zasoby-i-zrodla/zbiory-specjalne-i-archiwalia/tablica-pamiatkowa/&#13;
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                <text>A photograph of young Jan Łukasiewicz (21 December 1878 – 13 February 1956), the famous founder of the Polish school of logic, who had enormous influence on Arthur Prior's own development as a logician. Łukasiewicz is the inventor of the Polish notation – the logical symbolism that become the signature of Prior's own logical writings.&#13;
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                <text>The Library of the Faculty of Philosophy and Sociology of the University of Warsaw WFiS UW, the Institute of Philosophy and Sociology of the Polish Academy of Sciences IFiS PAN and the Polish Philosophical Society PTF, ul. Krakowskie Przedmieście 3, Warszawa, Poland&#13;
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                <text>A photograph of Arthur's colleague Carew Arthur Meredith (28 July 1904 – 31 March 1976), taken in Dublin in 1947. Meredith was a mathematician at the Trinity College Dublin and developed strong interest in formal logic under the influence of Jan Łukasiewicz, who taught in Dublin after the WWII. It was Łukasiewicz's suggestion to Meredith in 1952 to write to Prior in New Zealand, that started their productive collaboration and extensive correspondence.</text>
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