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Signed book: Vectorial Mechanics. First edition. London: Macmillan and Co., 1913. Hardcover, 5.75 x 8.75, 197 pages. Signed on the first free end page by the author, "Ludwik Silberstein," who adds notes to the front pastedown: "Rcvd. from Macmillan & Co. Ltd., in six copies, September 3rd, 1913, London" and "Published at 7/6, 1913, Revised to 10/0 in 1918." On two blank pages in the rear, Silberstein writes out notes under the heading "Hodograph of Keplerian Motion." Includes Silberstein's original memorandum of agreement from the publisher, three pages, 8.25 x 13.5, February 25, 1913, outlining the terms of the agreement and signed at the conclusion by the firm's director, "Maurice Macmillan." In overall very good to fine condition, with light edgewear to the book, and scattered staining to the publishing document.