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[MANUSCRIPTS] ARCHIVES of Dimitri RIABOUCHINSKY RIABOUCHINSKY, Dimitri (1882–1962) — Autograph A significant selection of working documents by Dimitri Riabouchinsky. Including: • Manuscript titled “Weight and Mass,” with numerous corrections and calculations. In Russian, 10 pp., 31 x 21 cm, as is; business card of D.P. Riabouchinsky. • Workbook by D. P. Riaboushinsky, without a cover, dating approximately from the late 1940s. In French and Russian, 70 pp., 29 x 19 cm, as is. The notebook contains a series of notes, including: the manuscript “Theoretical and Experimental Research on the Motion of a Compressible Fluid,” in French, with numerous calculations, as well as fragments of drafts of other works on the topic of fluid motion. • Scattered fragments of manuscripts and typewritten worksheets by D.P. Riabouchinsky containing calculations, notes, and drawings. In French, 39 pp. in total, various formats, as is; a fragment of a conclusion; pages from a book containing several handwritten corrections, in French, in poor condition. [MANUSCRIPTS] DMITRY RYABUSHINSKY ARCHIVE RYABUSHINSKY, Dmitry (1882–1962) – Autograph An important collection of Dmitry Ryabushinsky’s working materials. • Manuscript “Weight and Mass,” with numerous corrections and calculations. In Russian, 10 pages, 31 × 21 cm, bound; business card of D.P. Ryabushinsky. • D.P. Ryabushinsky’s work notebook, without a cover, ca. late 1940s. In French and Russian, 70 pages, 29 × 19 cm, in its original condition. The notebook contains a collection of notes, including: the manuscript “Theoretical and Experimental Studies of the Motion of a Compressible Fluid” in French, numerous calculations, and fragments of drafts of other works on the topic of fluid motion. • Scattered fragments of manuscripts and typewritten working sheets by D.P. Ryabushinsky containing calculations, notes, and drawings. In French, 39 pages total, of various sizes, in fair condition; a fragment of the conclusion, pages from a book with several handwritten corrections, in French, in poor condition.