@misc{indiciae23a5a72ae8b2,
  title = {Geophysical abstracts 96-99, January-December 1939},
  author = {W. Ayvazoglou},
  year = {1940},
  doi = {10.3133/b915},
  url = {https://pubs.usgs.gov/publication/b915},
  note = {Source identifier: b915}
}