Wasserkraft und Wasserwirtschaft
- 22.1927 Cornell-USA* = Google-USA* = Internet Archive
- 23.1928 Cornell-USA* = Google-USA* = Internet Archive
- 24.1929 Cornell-USA* = Google-USA* = Internet Archive
- Die nachfolgenden Bände werden zwischen 2027 (Jg. 1931) und 2038 (Jg. 1942) in den USA frei zugänglich und werden hier ergänzt
- 25.1930 Cornell-USA* = Google-USA*
- 26.1931 Cornell-USA* = Google-USA*
- 27.1932 Cornell-USA* = Google-USA*
- 28.1933 Cornell-USA* = Google-USA*
- 29.1934 Cornell-USA* = Google-USA*
- 30.1935 Cornell-USA* = Google-USA*, California-USA* = Google-USA* (30+31)
- 31.1936 Cornell-USA* = Google-USA*, California-USA* = Google-USA* (30+31)
- 32.1937 Cornell-USA* = Google-USA*, California-USA* = Google-USA* (32+33)
- 33.1938 Cornell-USA* = Google-USA*, California-USA* = Google-USA* (32+33)
- 34.1939 California-USA* = Google-USA* (34+35)
- 35.1940 California-USA* = Google-USA* (34+35)
- 36.1941 California-USA* = Google-USA* (nur H. 6-39???, unsicher!)
- 37.1942 Cornell-USA* = Google-USA*