1912-1954 in Keetmanshoop, Lüderitzbucht; Letters and reports, correspondence with individual personalities of the mission leadership, 1911-1969; curriculum vitae, application, certificates, 1910-1911; Protokoll d. Sprachexamens, 1913; "Gau-Sari-Aob", ed. Friedrich Hermann Rust, vol. 18, no. 3, 1931; Negotiations on connection with d. state pension funds, 1930-1932; death announcement and obituary for Mrs. Agnes Rust, née Sapel (mother) and photo from father's grave, 1934; death announcement and obituary for Mrs. Emma Rust, née Wandres, 1968;[correspondence especially with Fr. Siegfried Groth 1964-1978 and Gustav Menzel 1970-1974 s. VEM archive];