Appendix B
Sources from which Mr. Wanamaker drew the data for the life of his old friend were many and varied. Aside from his visits to Bucks County, his general reading on the subject of Philadelphia and its mercantile life in the decades immediately preceding his own career, and his personal contact with Isaiah Williamson, the biographer's sources were as follows:
- Diaries and letters of Isaiah V. Williamson.
- Notes by Mr. Helmbold, Mr. Williamson's secretary, concerning his employer's habits and philanthropies.
- Mr. Wanamaker's own autograph notes of conversations with Alfred Helmbold, and Frank Williamson, "regarding Isaiah V. Williamson."
- Ms. biographical data of Williamson family, including many letters, and the will of William Williamson, filed January 22, 1721.
- Account book of Isaiah V. Williamson.
- Collection of mementoes of Isaiah V. Williamson.
- One bound scrap book containing numerous newspaper clippings about Isaiah V. Williamson, and packages of news articles of various dates.
- Collection of biographical data prepared by the Evening Telegraph staff at the time of Mr. Williamson's death in 1889.
- Mass of data concerning the will of Isaiah V. Williamson.
- Correspondence concerning the foundation and early history of the Williamson School, in which Mr. Wanamaker played an active role.
- Collection of pamphlets, catalogues, and other printed matter concerning the Williamson School from its foundation to the date the biography was written.