Polytechnisches Centralblatt (Polytechnische Gesellschaft zu Berlin)
- 1=50.1888/89 Google = MDZ München, California = Google (50+51)
- 2=51.1889/90 Google = MDZ München, California = Google (50+51)
- 3=52.1890/91 Google = MDZ München, California = Google (52+53)
- 4=53.1891/92 Google = MDZ München, California = Google (52+53)
- 5=[54.]1892/93 Google = MDZ München
- 55.1893/94 Google = MDZ München
- 56.1894/95 Google = MDZ München
- 57.1896 Google = MDZ München
- 58.1897 Google = MDZ München
- 59.1898 Google = MDZ München
- 60.1899 {