Percy E. Lawler, was a bookseller working for the Rosenbach Company. He joined the company in 1916 and managed the Philadelphia store. He also received correspondence at their New York, N.Y. location on 322 East 57th Street. He formally had worked with Robert H. Dodd and Gabriel Weis. He was considered a likable man involved with many major transactions involving the company.
References:
American Book Collecting. A.S.W. Rosenbach's The unpublishable memoirs on display. December 1, 2016. http://www.bookcollectinghistory.com/2016/12/asw-rosenbachs-unpublishable-memoirs-on.html. Accessed 7/17/2018.
Personal notes. The Publisher's Weekly, October 14, 1916. p.1276. https://books.google.com/books?id=AK4xAQAAMAAJ&pg=PA1276&lpg=PA1276&dq=percy+e+lawler+rosenbach+company&source=bl&ots=yM6wVzlbEY&sig=BbrZOFTjdZOAb2GH7eDSHm3U5q8&hl=en&sa=X&ved=0ahUKEwi24vaCtqbcAhXOV98KHQVlD-QQ6AEIPDAD#v=onepage&q=percy%20e%20lawler%20rosenbach%20company&f=false. Accessed 7/17/2018.
Dumbarton Oaks Garden Archives, B:BF 1948.07.23, Dumbarton Oaks Research Library, Rare Book Collection. Dumbarton Oaks, Trustees for Harvard University, Washington, D.C. https://www.doaks.org/library-archives/garden-archives/correspondence/letters-and-notes/beatrix-farrand-to-percy-e-lawler-july-23-1948/. Accessed 7/17/2018.