Proceedings of the Engineers' Society of Western Pennsylvania.

v.1 1880/1881; v.5; v.5-6 1889-1890; v.6; v.7; v.7-8 1891-1892; v.8; v.8-10; v.9 1893; v.9-10 1893-1894; v.10 1894; v.11 1895; v.11-12 1895-1896; v.12 1896; v.13 1897; v.14 1898; v.15 1899; v.15-16 1899-1900; v.16 1900; v.17 1901; v.1 1880-02; v.17 1901-02; v.17 1901-1902; v.18 1902; v.19 1903; v.19 (1903-04); v.20 1904; v.20 1904-05; v.21 1905; v.21 no.1 1905 Feb; v.21 no.2 1905 Mar; v.21 no.6 1905 Jul; v.21 no.7 1905 Oct; v.21 no.8 1905 Nov; v.21 no.9 1905 Dec; v.21 (1905-06); v.21 no.10 1906 Jan; v.22 1906; v.22 (1906-07); v.22 1906-1907; v.22-23 1906-08; v.23 1907-08; v.23 1907-1908; v.24 1908; v.24 1908-09; v.24 1908-1909; v.25 (1909); v.25 1909-10; v.25 1909-1910; v.26 1910-11; v.26 1910-1911; v.27 (1911); v.27 1911-12; v.27 1911-1912; v.28 1912-13; v.28 1912-1913; v.29 1913-14; v.29 1913-1914; v.30 1914-15; v.30 1914-1915; v.30 (1914/15); v.31 1915-16; v.31 1915-1916; v.31 (1915/16); v.32 1916-17; v.32 1916-1917; v.32 (1916/17); v.33 1917-18; v.33 1917-1918; v.33 (1917/18); v.34 1918-19; v.34 1918-1919; v.34 (1918/19); v.35 1919-20; v.35 1919-1920; v.35 (1919/20); v.36 1920-21; v.36 1920-1921; v.36 (1920/21); v.37 1921-22; v.37 1921-1922; v.37 (1921/22); v.38 1922-23; v.38 1922-1923; v.38 (1922/23); v.39 1923; v.39 1923-1924; v.40 1924-25; v.40 1924-1925; v.41 1925-26; v.41 1925-1926; v.42 1926-27; v.42 1926-1927; v.43 1927-28; v.44 1928-29; v.45 1929; v.46 1930; v.47 1931; v.48-49 1932-33; v.48-49 1932-1933; index v. 1-20; index v.1/20 (1880/1904); index 1-20(1880-1904); index