The Dropsie College Isaac Leeser Collection spans the years 1822 through 1868, with the bulk of the collection concentrated between the years 1848 and 1867. Categories of documents to be found include correspondence, literary productions, financial records--largely relating to The Occident, and legal and printed materials.
Notable among the literary productions are: the complete manuscript of Leeser's translation from the original German into English of Moses Mendelssohn's famous work Jerusalem; a nearly complete manuscript translation of J. Johlson's Instruction in the Mosaic Religion, drafts of various published and unpublished discourses and sermons by Leeser, an incomplete manuscript of Leeser's Jews and the Mosaic Law; Leeser's school notebooks from his youth in Germany--the oldest materials in the collection--dated 1822. Among the fragmentary writings is a report, apparently translated into English, from the "Committee central for the building houses [sic] for the poor and the pilgrims in Jerusalem to the noble benefactors and the friends of this undertaking." The central committee is named as Jacob Ettlinger, Rabbi at Altona, Josef Hirsch, merchant at Halberstadt, and Dr. Israel Hildesheimer, Rabbi at Eisenstadt. The local committee is named as Moses Sachs, Josef Goldberger, Selig Hausdorf, and Meyer Schonbaum. Also of note are several letters and drafts of writings by and in the hand of Grace Aguilar, the prominent nineteenth century British Jewish literary figure. Several letters from Rebecca Gratz are also found in the correspondence series.
Of particular note is Leeser's correspondence with the Jewish community of Latin America. Leeser maintained a close relationship with Jews in Barbados, Curacao, Grenada, Jamaica, St. Thomas and Venezuela.